I’m still getting to know del.icio.us but so far it looks like a great social bookmarking tool. I check the Ajax and DHTML RSS feeds daily and there’s always something new. What’s the point of searching for new stuff when others have already found and bookmarked it? 
Here’s an alternate interface for del.icio.us: http://johnvey.com/features/deliciousdirector/
Delicious director looks pretty neat. Another social bookmarking site that offers a very compelling and friend UI for the personal bookmarks is http://www.blinklist.com. I really like the fact that you can star tags and links just like in gmail and that all my tags are organized by favorites, popular, and recent. It also has a quick tag access via search.