Index: wp-admin/includes/class-wp-ms-sites-list-table.php
===================================================================
--- wp-admin/includes/class-wp-ms-sites-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-ms-sites-list-table.php	(working copy)
@@ -213,6 +213,7 @@
 				switch ( $column_name ) {
 					case 'cb': ?>
 						<th scope="row" class="check-column">
+							<label class="screen-reader-text" for="blog_<?php echo $blog['blog_id']; ?>"><?php printf( __( 'Select %s' ), $blogname ); ?></label>
 							<input type="checkbox" id="blog_<?php echo $blog['blog_id'] ?>" name="allblogs[]" value="<?php echo esc_attr( $blog['blog_id'] ) ?>" />
 						</th>
 					<?php
Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -492,10 +492,12 @@
 
 			case 'cb':
 			?>
-			<th scope="row" class="check-column"><?php if ( $can_edit_post ) { ?>
-			<label class="screen-reader-text" for="cb-select-<?php the_ID(); ?>"><?php printf( __( 'Select %s' ), $title );
-			?></label><input id="cb-select-<?php the_ID(); ?>" type="checkbox" name="post[]" value="<?php the_ID(); ?>" />
-			<?php } ?></th>
+			<th scope="row" class="check-column">
+				<?php if ( $can_edit_post ) { ?>
+				<label class="screen-reader-text" for="cb-select-<?php the_ID(); ?>"><?php printf( __( 'Select %s' ), $title ); ?></label>
+				<input id="cb-select-<?php the_ID(); ?>" type="checkbox" name="post[]" value="<?php the_ID(); ?>" />
+				<?php } ?>
+			</th>
 			<?php
 			break;
 
Index: wp-admin/includes/class-wp-media-list-table.php
===================================================================
--- wp-admin/includes/class-wp-media-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-media-list-table.php	(working copy)
@@ -191,7 +191,7 @@
 ?>
 		<th scope="row" class="check-column">
 			<?php if ( $user_can_edit ) { ?>
-				<label for="cb-select-<?php the_ID(); ?>" class="screen-reader-text"><?php echo sprintf( __( 'Select %s' ), $att_title );?></label>
+				<label class="screen-reader-text" for="cb-select-<?php the_ID(); ?>"><?php echo sprintf( __( 'Select %s' ), $att_title );?></label>
 				<input type="checkbox" name="media[]" id="cb-select-<?php the_ID(); ?>" value="<?php the_ID(); ?>" />
 			<?php } ?>
 		</th>
Index: wp-admin/includes/class-wp-links-list-table.php
===================================================================
--- wp-admin/includes/class-wp-links-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-links-list-table.php	(working copy)
@@ -128,9 +128,12 @@
 				$attributes = $class . $style;
 
 				switch ( $column_name ) {
-					case 'cb':
-						echo '<th scope="row" class="check-column"><label for="cb-select-' . $link->link_id . '" class="screen-reader-text">' . sprintf( __( 'Select %s' ), $link->link_name )
-								. '</label><input type="checkbox" name="linkcheck[]" id="cb-select-' . $link->link_id . '" value="'. esc_attr( $link->link_id ) .'" /></th>';
+					case 'cb': ?>
+						<th scope="row" class="check-column">
+							<label class="screen-reader-text" for="cb-select-<?php echo $link->link_id; ?>"><?php echo sprintf( __( 'Select %s' ), $link->link_name ); ?></label>
+							<input type="checkbox" name="linkcheck[]" id="cb-select-<?php echo $link->link_id; ?>" value="<?php echo esc_attr( $link->link_id ); ?>" />
+						</th>
+						<?php
 						break;
 
 					case 'name':
Index: wp-admin/includes/class-wp-terms-list-table.php
===================================================================
--- wp-admin/includes/class-wp-terms-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-terms-list-table.php	(working copy)
@@ -236,8 +236,8 @@
 		$default_term = get_option( 'default_' . $taxonomy );
 
 		if ( current_user_can( $tax->cap->delete_terms ) && $tag->term_id != $default_term )
-			return '<label for="cb-select-' . $tag->term_id . '" class="screen-reader-text">' . sprintf( __( 'Select %s' ), $tag->name )
-				. '</label><input type="checkbox" name="delete_tags[]" value="' . $tag->term_id . '" id="cb-select-' . $tag->term_id . '" />';
+			return '<label class="screen-reader-text" for="cb-select-' . $tag->term_id . '">' . sprintf( __( 'Select %s' ), $tag->name ) . '</label>'
+				. '<input type="checkbox" name="delete_tags[]" value="' . $tag->term_id . '" id="cb-select-' . $tag->term_id . '" />';
 
 		return '&nbsp;';
 	}
Index: wp-admin/includes/class-wp-users-list-table.php
===================================================================
--- wp-admin/includes/class-wp-users-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-users-list-table.php	(working copy)
@@ -256,8 +256,8 @@
 			$edit .= $this->row_actions( $actions );
 
 			// Set up the checkbox ( because the user is editable, otherwise its empty )
-			$checkbox = '<label for="cb-select-' . $user_object->ID . '" class="screen-reader-text">' . sprintf( __( 'Select %s' ), $user_object->user_login )
-						. "</label><input type='checkbox' name='users[]' id='user_{$user_object->ID}' class='$role' value='{$user_object->ID}' />";
+			$checkbox = '<label class="screen-reader-text" for="cb-select-' . $user_object->ID . '">' . sprintf( __( 'Select %s' ), $user_object->user_login ) . '</label>'
+						. "<input type='checkbox' name='users[]' id='user_{$user_object->ID}' class='$role' value='{$user_object->ID}' />";
 
 		} else {
 			$edit = '<strong>' . $user_object->user_login . '</strong>';
Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -666,8 +666,8 @@
 
 		if ( ! empty( $columns['cb'] ) ) {
 			static $cb_counter = 1;
-			$columns['cb'] = '<label class="screen-reader-text" for="cb-select-all-' . $cb_counter . '">' . __( 'Select All' )
-				. '</label><input id="cb-select-all-' . $cb_counter . '" type="checkbox" />';
+			$columns['cb'] = '<label class="screen-reader-text" for="cb-select-all-' . $cb_counter . '">' . __( 'Select All' ) . '</label>'
+				. '<input id="cb-select-all-' . $cb_counter . '" type="checkbox" />';
 			$cb_counter++;
 		}
 
Index: wp-admin/includes/class-wp-ms-users-list-table.php
===================================================================
--- wp-admin/includes/class-wp-ms-users-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-ms-users-list-table.php	(working copy)
@@ -165,6 +165,7 @@
 				switch ( $column_name ) {
 					case 'cb': ?>
 						<th scope="row" class="check-column">
+							<label class="screen-reader-text" for="blog_<?php echo $user->ID; ?>"><?php echo sprintf( __( 'Select %s' ), $user->user_login ); ?></label>
 							<input type="checkbox" id="blog_<?php echo $user->ID ?>" name="allusers[]" value="<?php echo esc_attr( $user->ID ) ?>" />
 						</th>
 					<?php
Index: wp-admin/includes/theme-install.php
===================================================================
--- wp-admin/includes/theme-install.php	(revision 21321)
+++ wp-admin/includes/theme-install.php	(working copy)
@@ -58,15 +58,27 @@
 <form id="search-themes" method="get" action="">
 	<input type="hidden" name="tab" value="search" />
 	<?php if ( $type_selector ) : ?>
-	<label class="screen-reader-text" for="typeselector"><?php _e("Type of search"); ?></label>
+	<label class="screen-reader-text" for="typeselector"><?php _e('Type of search'); ?></label>
 	<select	name="type" id="typeselector">
 	<option value="term" <?php selected('term', $type) ?>><?php _e('Keyword'); ?></option>
 	<option value="author" <?php selected('author', $type) ?>><?php _e('Author'); ?></option>
 	<option value="tag" <?php selected('tag', $type) ?>><?php _ex('Tag', 'Theme Installer'); ?></option>
 	</select>
-	<label class="screen-reader-text" for="s"><?php printf( __("Search by %s"), ( $type == 'term' ? __( 'keyword' ) : $type ) ); ?></label>
+	<label class="screen-reader-text" for="s"><?php
+	switch ( $type ) {
+		case 'term':
+			_e( 'Search by keyword' );
+			break;
+		case 'author':
+			_e( 'Search by author' );
+			break;
+		case 'tag':
+			_e( 'Search by tag' );
+			break;
+	}
+	?></label>
 	<?php else : ?>
-	<label class="screen-reader-text" for="s"><?php _e("Search by keyword"); ?></label>
+	<label class="screen-reader-text" for="s"><?php _e('Search by keyword'); ?></label>
 	<?php endif; ?>
 	<input type="search" name="s" id="s" size="30" value="<?php echo esc_attr($term) ?>" autofocus="autofocus" />
 	<?php submit_button( __( 'Search' ), 'button', 'search', false ); ?>
Index: wp-admin/includes/class-wp-plugins-list-table.php
===================================================================
--- wp-admin/includes/class-wp-plugins-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-plugins-list-table.php	(working copy)
@@ -371,7 +371,12 @@
 
 		$class = $is_active ? 'active' : 'inactive';
 		$checkbox_id =  "checkbox_" . md5($plugin_data['Name']);
-		$checkbox = in_array( $status, array( 'mustuse', 'dropins' ) ) ? '' : "<input type='checkbox' name='checked[]' value='" . esc_attr( $plugin_file ) . "' id='" . $checkbox_id . "' /><label class='screen-reader-text' for='" . $checkbox_id . "' >" . __('Select') . " " . $plugin_data['Name'] . "</label>";
+		if ( in_array( $status, array( 'mustuse', 'dropins' ) ) ) {
+			$checkbox = '';
+		} else {
+			$checkbox = "<label class='screen-reader-text' for='" . $checkbox_id . "' >" . sprintf( __( 'Select %s' ), $plugin_data['Name'] ) . "</label>"
+				. "<input type='checkbox' name='checked[]' value='" . esc_attr( $plugin_file ) . "' id='" . $checkbox_id . "' />";
+		}
 		if ( 'dropins' != $context ) {
 			$description = '<p>' . ( $plugin_data['Description'] ? $plugin_data['Description'] : '&nbsp;' ) . '</p>';
 			$plugin_name = $plugin_data['Name'];
Index: wp-admin/includes/class-wp-comments-list-table.php
===================================================================
--- wp-admin/includes/class-wp-comments-list-table.php	(revision 21321)
+++ wp-admin/includes/class-wp-comments-list-table.php	(working copy)
@@ -317,9 +317,10 @@
 	}
 
 	function column_cb( $comment ) {
-		if ( $this->user_can ) {
-			echo '<label class="screen-reader-text" for="cb-select-' . $comment->comment_ID . '">' . __( 'Select comment' )
-				. "</label><input id='cb-select-$comment->comment_ID' type='checkbox' name='delete_comments[]' value='$comment->comment_ID' />";
+		if ( $this->user_can ) { ?>
+		<label class="screen-reader-text" for="cb-select-<?php echo $comment->comment_ID; ?>"><?php _e( 'Select comment' ); ?></label>
+		<input id="cb-select-<?php echo $comment->comment_ID; ?>" type="checkbox" name="delete_comments[]" value="<?php echo $comment->comment_ID; ?>" />
+		<?php
 		}
 	}