Index: wp-admin/includes/class-wp-users-list-table.php
===================================================================
--- wp-admin/includes/class-wp-users-list-table.php	(revision 16559)
+++ wp-admin/includes/class-wp-users-list-table.php	(working copy)
@@ -7,7 +7,23 @@
  * @since 3.1.0
  */
 class WP_Users_List_Table extends WP_List_Table {
+	
+	var $site_id;
+	var $is_site_users;
+	
+	function WP_Users_List_Table() {
+		$screen = get_current_screen();
+		$this->is_site_users = ( 'site-users-network' == $screen->id ) ? true : false;
 
+		if ( $this->is_site_users )
+			$this->site_id = isset( $_REQUEST['id'] ) ? intval( $_REQUEST['id'] ) : 0;
+
+		parent::WP_List_Table( array(
+			'singular' => 'user',
+			'plural'   => 'users'
+		) );
+	}
+
 	function check_permissions() {
 		if ( !current_user_can('list_users') )
 			wp_die(__('Cheatin&#8217; uh?'));
@@ -30,6 +46,9 @@
 			'role' => $role,
 			'search' => $usersearch
 		);
+		
+		if ( $this->is_site_users )
+			$args['blog_id'] = $this->site_id;
 
 		if ( isset( $_REQUEST['orderby'] ) )
 			$args['orderby'] = $_REQUEST['orderby'];
@@ -55,7 +74,15 @@
 	function get_views() {
 		global $wp_roles, $role;
 
-		$users_of_blog = count_users();
+		if ( $this->is_site_users ) {
+			$url = 'site-users.php?id=' . $this->site_id;			
+			switch_to_blog( $this->site_id );
+			$users_of_blog = count_users();
+			restore_current_blog();
+		} else {
+			$url = 'users.php';
+			$users_of_blog = count_users();
+		}
 		$total_users = $users_of_blog['total_users'];
 		$avail_roles =& $users_of_blog['avail_roles'];
 		unset($users_of_blog);
@@ -63,7 +90,7 @@
 		$current_role = false;
 		$class = empty($role) ? ' class="current"' : '';
 		$role_links = array();
-		$role_links['all'] = "<a href='users.php'$class>" . sprintf( _nx( 'All <span class="count">(%s)</span>', 'All <span class="count">(%s)</span>', $total_users, 'users' ), number_format_i18n( $total_users ) ) . '</a>';
+		$role_links['all'] = "<a href='$url'$class>" . sprintf( _nx( 'All <span class="count">(%s)</span>', 'All <span class="count">(%s)</span>', $total_users, 'users' ), number_format_i18n( $total_users ) ) . '</a>';
 		foreach ( $wp_roles->get_names() as $this_role => $name ) {
 			if ( !isset($avail_roles[$this_role]) )
 				continue;
@@ -78,7 +105,7 @@
 			$name = translate_user_role( $name );
 			/* translators: User role name with count */
 			$name = sprintf( __('%1$s <span class="count">(%2$s)</span>'), $name, $avail_roles[$this_role] );
-			$role_links[$this_role] = "<a href='users.php?role=$this_role'$class>$name</a>";
+			$role_links[$this_role] = "<a href='" . add_query_arg( 'role', $this_role, $url ) . "'$class>$name</a>";
 		}
 
 		return $role_links;
@@ -171,6 +198,11 @@
 			$user_object = new WP_User( (int) $user_object );
 		$user_object = sanitize_user_object( $user_object, 'display' );
 		$email = $user_object->user_email;
+		
+		if ( $this->is_site_users )
+			$url = "site-users.php?id={$this->site_id}&amp;";
+		else
+			$url = 'users.php?';
 
 		$checkbox = '';
 		// Check if the user for this row is editable
@@ -197,7 +229,7 @@
 			if ( !is_multisite() && get_current_user_id() != $user_object->ID && current_user_can( 'delete_user', $user_object->ID ) )
 				$actions['delete'] = "<a class='submitdelete' href='" . wp_nonce_url( "users.php?action=delete&amp;user=$user_object->ID", 'bulk-users' ) . "'>" . __( 'Delete' ) . "</a>";
 			if ( is_multisite() && get_current_user_id() != $user_object->ID && current_user_can( 'remove_user', $user_object->ID ) )
-				$actions['remove'] = "<a class='submitdelete' href='" . wp_nonce_url( "users.php?action=remove&amp;user=$user_object->ID", 'bulk-users' ) . "'>" . __( 'Remove' ) . "</a>";
+				$actions['remove'] = "<a class='submitdelete' href='" . wp_nonce_url( $url."action=remove&amp;user=$user_object->ID", 'bulk-users' ) . "'>" . __( 'Remove' ) . "</a>";
 			$actions = apply_filters( 'user_row_actions', $actions, $user_object );
 			$edit .= $this->row_actions( $actions );
 
Index: wp-admin/network/site-users.php
===================================================================
--- wp-admin/network/site-users.php	(revision 16559)
+++ wp-admin/network/site-users.php	(working copy)
@@ -1,6 +1,6 @@
 <?php
 /**
- * Edit Site Users Administration Screen
+ * Edit Site Themes Administration Screen
  *
  * @package WordPress
  * @subpackage Multisite
@@ -13,9 +13,17 @@
 if ( ! is_multisite() )
 	wp_die( __( 'Multisite support is not enabled.' ) );
 
-if ( ! current_user_can('manage_sites') )
-	wp_die(__('You do not have sufficient permissions to edit this site.'));
+$wp_list_table = get_list_table('WP_Users_List_Table');
+$wp_list_table->check_permissions();
+$wp_list_table->prepare_items();
 
+$action = $wp_list_table->current_action();
+
+$s = isset($_REQUEST['s']) ? $_REQUEST['s'] : '';
+
+// Clean up request URI from temporary args for screen options/paging uri's to work as expected.
+$_SERVER['REQUEST_URI'] = remove_query_arg(array('enable', 'disable', 'enable-selected', 'disable-selected'), $_SERVER['REQUEST_URI']);
+
 $id = isset( $_REQUEST['id'] ) ? intval( $_REQUEST['id'] ) : 0;
 
 if ( ! $id )
@@ -38,74 +46,65 @@
 	$editblog_roles = $wp_roles->roles;
 }
 
-if ( isset($_REQUEST['action']) && 'update-site' == $_REQUEST['action'] ) {
-	check_admin_referer( 'edit-site' );
+$action = $wp_list_table->current_action();
 
+if ( $action ) {
 	switch_to_blog( $id );
+	
+	switch ( $action ) {
+		case 'adduser':
+			if ( !empty( $_POST['newuser'] ) ) {
+				$newuser = $_POST['newuser'];
+				$userid = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM " . $wpdb->users . " WHERE user_login = %s", $newuser ) );
+				if ( $userid ) {
+					$user = $wpdb->get_var( "SELECT user_id FROM " . $wpdb->usermeta . " WHERE user_id='$userid' AND meta_key='{$blog_prefix}capabilities'" );
+					if ( $user == false )
+						add_user_to_blog( $id, $userid, $_POST['new_role'] );
+				}
+			}
+			break;
+		
+		case 'remove':
+			if ( !current_user_can('remove_users')  )
+				die(__('You can&#8217;t remove users.'));
 
-	// user roles
-	if ( isset( $_POST['role'] ) && is_array( $_POST['role'] ) == true ) {
-		$newroles = $_POST['role'];
+			if ( isset( $_REQUEST['users'] ) ) {
+				$userids = $_REQUEST['users'];
 
-		reset( $newroles );
-		foreach ( (array) $newroles as $userid => $role ) {
-			$user = new WP_User( $userid );
-			if ( empty( $user->ID ) )
-				continue;
-			$user->for_blog( $id );
-			$user->set_role( $role );
-		}
-	}
+				foreach ( $userids as $user_id ) {
+					$user_id = (int) $user_id;
+					remove_user_from_blog( $user_id, $id );
+				}
+			} else {
+				remove_user_from_blog( $_GET['user'] );
+			}
+			break;
 
-	// remove user
-	if ( isset( $_POST['blogusers'] ) && is_array( $_POST['blogusers'] ) ) {
-		reset( $_POST['blogusers'] );
-		foreach ( (array) $_POST['blogusers'] as $key => $val )
-			remove_user_from_blog( $key, $id );
-	}
+		case 'promote':
+			$editable_roles = get_editable_roles();
+			if ( empty( $editable_roles[$_REQUEST['new_role']] ) )
+				wp_die(__('You can&#8217;t give users that role.'));
 
-	// change password
-	if ( isset( $_POST['user_password'] ) && is_array( $_POST['user_password'] ) ) {
-		reset( $_POST['user_password'] );
-		$newroles = $_POST['role'];
-		foreach ( (array) $_POST['user_password'] as $userid => $pass ) {
-			unset( $_POST['role'] );
-			$_POST['role'] = $newroles[ $userid ];
-			if ( $pass != '' ) {
-				$cap = $wpdb->get_var( $wpdb->prepare( "SELECT meta_value FROM {$wpdb->usermeta} WHERE user_id = %d AND meta_key = '{$blog_prefix}capabilities' AND meta_value = 'a:0:{}'", $userid ) );
-				$userdata = get_userdata($userid);
-				$_POST['pass1'] = $_POST['pass2'] = $pass;
-				$_POST['email'] = $userdata->user_email;
-				$_POST['rich_editing'] = $userdata->rich_editing;
-				edit_user( $userid );
-				if ( $cap == null )
-					$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->usermeta} WHERE user_id = %d AND meta_key = '{$blog_prefix}capabilities' AND meta_value = 'a:0:{}'", $userid ) );
-			}
-		}
-		unset( $_POST['role'] );
-		$_POST['role'] = $newroles;
-	}
+			$userids = $_REQUEST['users'];
+			$update = 'promote';
+			foreach ( $userids as $user_id ) {
+				$user_id = (int) $user_id;
 
-	// add user
-	if ( !empty( $_POST['newuser'] ) ) {
-		$newuser = $_POST['newuser'];
-		$userid = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM " . $wpdb->users . " WHERE user_login = %s", $newuser ) );
-		if ( $userid ) {
-			$user = $wpdb->get_var( "SELECT user_id FROM " . $wpdb->usermeta . " WHERE user_id='$userid' AND meta_key='{$blog_prefix}capabilities'" );
-			if ( $user == false )
-				add_user_to_blog( $id, $userid, $_POST['new_role'] );
-		}
-	}
+				// If the user doesn't already belong to the blog, bail.
+				if ( !is_user_member_of_blog( $user_id ) )
+					wp_die(__('Cheatin&#8217; uh?'));
 
+				$user = new WP_User( $user_id );
+				$user->set_role( $_REQUEST['new_role'] );
+			}
+			break;
+	}
+	
 	restore_current_blog();
-	wp_redirect( add_query_arg( array( 'update' => 'updated', 'id' => $id ), 'site-users.php') );
+	wp_redirect( wp_get_referer() ); // @todo add_query_arg for update message
 }
 
-if ( isset($_GET['update']) ) {
-	$messages = array();
-	if ( 'updated' == $_GET['update'] )
-		$messages[] = __('Site users updated.');
-}
+add_screen_option( 'per_page', array( 'label' => _x( 'Users', 'users per page (screen options)' ) ) );
 
 $title = sprintf( __('Edit Site: %s'), get_blogaddress_by_id($id));
 $parent_file = 'sites.php';
@@ -128,61 +127,27 @@
 }
 ?>
 </h3>
-<?php
-if ( ! empty( $messages ) ) {
-	foreach ( $messages as $msg )
-		echo '<div id="message" class="updated"><p>' . $msg . '</p></div>';
-} ?>
+<form class="search-form" action="" method="get">
+<p class="search-box">
+	<label class="screen-reader-text" for="user-search-input"><?php _e( 'Search Users' ); ?>:</label>
+	<input type="text" id="user-search-input" name="s" value="<?php echo esc_attr($usersearch); ?>" />
+	<?php submit_button( __( 'Search Users' ), 'button', 'submit', false ); ?>
+</p>
+</form>
+
+<?php $wp_list_table->views(); ?>
+
 <form method="post" action="site-users.php?action=update-site">
 	<?php wp_nonce_field( 'edit-site' ); ?>
 	<input type="hidden" name="id" value="<?php echo esc_attr( $id ) ?>" />
-<?php
-$blogusers = get_users( array( 'blog_id' => $id, 'number' => 20 ) );
 
-if ( is_array( $blogusers ) ) {
-	echo '<table class="form-table">';
-	echo "<tr><th>" . __( 'User' ) . "</th><th>" . __( 'Role' ) . "</th><th>" . __( 'Password' ) . "</th><th>" . __( 'Remove' ) . "</th></tr>";
-	$user_count = 0;
+<?php $wp_list_table->display(); ?>
 
-	foreach ( $blogusers as $user_id => $user_object ) {
-		$user_count++;
-		$existing_role = reset( $user_object->roles );
-
-		echo '<tr><td><a href="user-edit.php?user_id=' . $user_id . '">' . $user_object->user_login . '</a></td>';
-		if ( $user_id != $current_user->data->ID ) {
-			?>
-			<td>
-				<select name="role[<?php echo $user_id ?>]" id="new_role_1"><?php
-					foreach ( $editblog_roles as $role => $role_assoc ){
-						$name = translate_user_role( $role_assoc['name'] );
-						echo '<option ' . selected( $role, $existing_role, false ) . ' value="' . esc_attr( $role ) . '">' . esc_html( $name ) . '</option>';
-					}
-					?>
-				</select>
-			</td>
-			<td>
-				<input type="text" name="user_password[<?php echo esc_attr( $user_id ) ?>]" />
-			</td>
-			<?php
-			echo '<td><input title="' . __( 'Click to remove user' ) . '" type="checkbox" name="blogusers[' . esc_attr( $user_id ) . ']" /></td>';
-		} else {
-			echo "<td><strong>" . __ ( 'N/A' ) . "</strong></td><td><strong>" . __ ( 'N/A' ) . "</strong></td><td><strong>" . __( 'N/A' ) . "</strong></td>";
-		}
-		echo '</tr>';
-	}
-	echo "</table>";
-	submit_button();
-	if ( 20 == $user_count )
-		echo '<p>' . sprintf( __('First 20 users shown. <a href="%s">Manage all users</a>.'), get_admin_url($id, 'users.php') ) . '</p>';
-} else {
-	_e('This site has no users.');
-}
-?>
 </form>
 
 <h3 id="add-new-user"><?php _e('Add Existing User') ?></h3>
 <p class="description"><?php _e( 'Enter the username of an existing user.' ) ?></p>
-	<form action="site-users.php?action=update-site" id="adduser" method="post">
+	<form action="site-users.php?action=adduser" id="adduser" method="post">
 	<?php wp_nonce_field( 'edit-site' ); ?>
 	<input type="hidden" name="id" value="<?php echo esc_attr( $id ) ?>" />
 	<table class="form-table">
