Index: wp-admin/themes.php
===================================================================
--- wp-admin/themes.php	(revision 10990)
+++ wp-admin/themes.php	(working copy)
@@ -46,7 +46,7 @@
 $themes = get_themes();
 $ct = current_theme_info();
 
-ksort( $themes );
+uksort( $themes, "strnatcasecmp" );
 $theme_total = count( $themes );
 $per_page = 15;