Index: wp-admin/includes/class-wp-ms-themes-list-table.php
===================================================================
--- wp-admin/includes/class-wp-ms-themes-list-table.php	(revision 17091)
+++ wp-admin/includes/class-wp-ms-themes-list-table.php	(working copy)
@@ -231,9 +231,12 @@
 			$actions['enable-selected'] = $this->is_site_themes ? __( 'Enable' ) : __( 'Network Enable' );
 		if ( 'disabled' != $status )
 			$actions['disable-selected'] = $this->is_site_themes ? __( 'Disable' ) : __( 'Network Disable' );
-		if ( current_user_can( 'update_themes' ) && !$this->is_site_themes )
-			$actions['update-selected'] = __( 'Update' );
-
+		if ( ! $this->is_site_themes ) {
+			if ( current_user_can( 'delete_themes' ) )
+				$actions['delete-selected'] = __( 'Delete' );
+			if ( current_user_can( 'update_themes' ) )
+				$actions['update-selected'] = __( 'Update' );
+		}
 		return $actions;
 	}
 
@@ -265,7 +268,8 @@
 		$actions = array(
 			'enable' => '',
 			'disable' => '',
-			'edit' => ''
+			'edit' => '',
+			'delete' => ''
 		);
 
 		$theme_key = esc_html( $theme['Stylesheet'] );
@@ -277,10 +281,13 @@
 
 		if ( current_user_can('edit_themes') )
 			$actions['edit'] = '<a href="theme-editor.php?theme=' . $theme['Name'] . '" title="' . __('Open this theme in the Theme Editor') . '" class="edit">' . __('Edit') . '</a>';
+			
+		if ( empty( $theme['enabled'] ) && current_user_can( 'delete_themes' ) && ! $this->is_site_themes )
+			$actions['delete'] = '<a href="' . wp_nonce_url( 'themes.php?action=delete-selected&amp;checked[]=' . $theme_key . '&amp;theme_status=' . $context . '&amp;paged=' . $page . '&amp;s=' . $s, 'bulk-themes' ) . '" title="' . __( 'Delete this theme' ) . '" class="delete">' . __( 'Delete' ) . '</a>';
 
 		$actions = apply_filters( 'theme_action_links', array_filter( $actions ), $theme_key, $theme, $context );
 		$actions = apply_filters( "theme_action_links_$theme_key", $actions, $theme_key, $theme, $context );
-
+ 
 		$class = empty( $theme['enabled'] ) ? 'inactive' : 'active';
 		$checkbox_id = md5($theme['Name']) . "_checkbox";
 		$checkbox = "<input type='checkbox' name='checked[]' value='" . esc_attr( $theme_key ) . "' id='" . $checkbox_id . "' /><label class='screen-reader-text' for='" . $checkbox_id . "' >" . __('Select') . " " . $theme['Name'] . "</label>";
Index: wp-admin/network/themes.php
===================================================================
--- wp-admin/network/themes.php	(revision 17091)
+++ wp-admin/network/themes.php	(working copy)
@@ -65,6 +65,95 @@
 				unset( $allowed_themes[ $theme ] );
 			update_site_option( 'allowedthemes', $allowed_themes );
 			break;
+		case 'delete':
+			check_admin_referer('delete-theme_' . $_GET['template']);
+			if ( !current_user_can('delete_themes') )
+				wp_die( __( 'Cheatin&#8217; uh?' ) );
+			delete_theme($_GET['template']);
+			wp_redirect( network_admin_url('themes.php?deleted=true') );
+			exit;
+			break;
+		case 'delete-selected':
+			if ( ! current_user_can( 'delete_themes' ) )
+				wp_die( __('You do not have sufficient permissions to delete themes for this site.') );
+
+			$themes = isset( $_REQUEST['checked'] ) ? (array) $_REQUEST['checked'] : array();
+			if ( empty( $themes ) ) {
+				wp_redirect( wp_get_referer() );
+				exit;
+			}
+
+			$main_theme = get_current_theme();
+			$files_to_delete = $theme_info = array();
+			foreach( $themes as $key => $theme ) {
+				$data = get_theme_data( WP_CONTENT_DIR . '/themes/' . $theme . '/style.css' );
+				if ( $data['Name'] == $main_theme ) {
+					unset( $themes[$key] );
+				} else {
+					$files_to_delete = array_merge( $files_to_delete, list_files( WP_CONTENT_DIR . "/themes/$theme" ) );					
+					$theme_info[ $theme ] = $data;
+				}
+			}
+			
+			if ( empty( $themes ) ) {
+				wp_redirect( add_query_arg( 'error', 'main', wp_get_referer() ) );
+				exit;
+			}
+			
+			include(ABSPATH . 'wp-admin/update.php');
+
+			$parent_file = 'themes.php';
+
+			if ( ! isset( $_REQUEST['verify-delete'] ) ) {
+				wp_enqueue_script( 'jquery' );
+				require_once( ABSPATH . 'wp-admin/admin-header.php' );
+				?>
+			<div class="wrap">
+				<?php
+					$themes_to_delete = count( $themes );
+					screen_icon();
+					echo '<h2>' . _n( 'Delete Theme', 'Delete Themes', $themes_to_delete ) . '</h2>';
+				?>
+				<div class="error"><p><strong><?php _e( 'Caution:' ); ?></strong> <?php echo _n( 'This theme may be active on other sites in the network.', 'These themes may be active on other sites in the network.', $themes_to_delete ); ?></p></div>
+				<p><?php echo _n( 'You are about to remove the following theme:', 'You are about to remove the following themes:', $themes_to_delete ); ?></p>
+					<ul class="ul-disc">
+						<?php foreach ( $theme_info as $theme )
+							echo '<li>', sprintf( __('<strong>%1$s</strong> by <em>%2$s</em>' ), esc_html( $theme['Name'] ), esc_html( $theme['AuthorName'] ) ), '</li>'; /* translators: 1: theme name, 2: theme author */ ?>
+					</ul>
+				<p><?php _e('Are you sure you wish to delete these themes?'); ?></p>
+				<form method="post" action="<?php echo esc_url($_SERVER['REQUEST_URI']); ?>" style="display:inline;">
+					<input type="hidden" name="verify-delete" value="1" />
+					<input type="hidden" name="action" value="delete-selected" />
+					<?php
+						foreach ( (array) $themes as $theme )
+							echo '<input type="hidden" name="checked[]" value="' . esc_attr($theme) . '" />';
+					?>
+					<?php wp_nonce_field('bulk-themes') ?>
+					<?php submit_button( _n( 'Yes, Delete this theme', 'Yes, Delete these themes', $themes_to_delete ), 'button', 'submit', false ); ?>
+				</form>
+				<form method="post" action="<?php echo esc_url(wp_get_referer()); ?>" style="display:inline;">
+					<?php submit_button( __( 'No, Return me to the theme list' ), 'button', 'submit', false ); ?>
+				</form>
+
+				<p><a href="#" onclick="jQuery('#files-list').toggle(); return false;"><?php _e('Click to view entire list of files which will be deleted'); ?></a></p>
+				<div id="files-list" style="display:none;">
+					<ul class="code">
+					<?php
+						foreach ( (array) $files_to_delete as $file )
+							echo '<li>' . esc_html( str_replace( WP_CONTENT_DIR . "/themes", '', $file) ) . '</li>';
+					?>
+					</ul>
+				</div>
+			</div>
+				<?php
+				require_once(ABSPATH . 'wp-admin/admin-footer.php');
+				exit;
+			} //Endif verify-delete
+			foreach( $themes as $theme )
+				$delete_result = delete_theme( $theme );
+			wp_redirect( network_admin_url( 'themes.php?deleted=true' ) );
+			exit;
+			break;
 	}
 }
 
@@ -87,6 +176,11 @@
 
 require_once(ABSPATH . 'wp-admin/admin-header.php');
 
+if ( isset( $_GET['deleted'] ) ) : ?>
+<div class="updated"><p><?php _e('Theme deleted.') ?></p></div><?php
+elseif ( isset( $_GET['error'] ) && 'main' == $_GET['error'] ) : ?>
+<div class="error"><p><?php _e( 'You cannot delete a theme while it is active on the main site.' ); ?></p></div><?php
+endif;
 ?>
 
 <div class="wrap">