Index: wp-admin/js/editor.js
===================================================================
--- wp-admin/js/editor.js	(revision 23348)
+++ wp-admin/js/editor.js	(working copy)
@@ -80,7 +80,7 @@
 		}
 
 		// Pretty it up for the source editor
-		blocklist1 = 'blockquote|ul|ol|li|table|thead|tbody|tfoot|tr|th|td|div|h[1-6]|p|fieldset';
+		blocklist1 = 'blockquote|ul|ol|li|dl|dt|dd|table|thead|tbody|tfoot|tr|th|td|div|h[1-6]|p|fieldset';
 		content = content.replace(new RegExp('\\s*</('+blocklist1+')>\\s*', 'g'), '</$1>\n');
 		content = content.replace(new RegExp('\\s*<((?:'+blocklist1+')(?: [^>]*)?)>', 'g'), '\n<$1>');
 
@@ -102,7 +102,7 @@
 		content = content.replace(/\s*\[caption([^\[]+)\[\/caption\]\s*/gi, '\n\n[caption$1[/caption]\n\n');
 		content = content.replace(/caption\]\n\n+\[caption/g, 'caption]\n\n[caption');
 
-		blocklist2 = 'blockquote|ul|ol|li|table|thead|tbody|tfoot|tr|th|td|h[1-6]|pre|fieldset';
+		blocklist2 = 'blockquote|ul|ol|li|dl|dt|dd|table|thead|tbody|tfoot|tr|th|td|h[1-6]|pre|fieldset';
 		content = content.replace(new RegExp('\\s*<((?:'+blocklist2+')(?: [^>]*)?)\\s*>', 'g'), '\n<$1>');
 		content = content.replace(new RegExp('\\s*</('+blocklist2+')>\\s*', 'g'), '</$1>\n');
 		content = content.replace(/<li([^>]*)>/g, '\t<li$1>');