WOW!! Rated 4 out of 5 stars
Nice easy and very fast too!
But if I'm a Konqueror user http://www.konqueror.org/ (Opera, Safari etc.) I don't have a pretty good support, It's very clumsy, and del.icio.us has a much better support for this users.
You'll need to give us an option to select between 2 WebUI views. The one that you already have, and the other like the del.icio.us WebUI or similar to it (with Bookmarklets Buttons & RSS support for (tags) labels too)