I’ve been a fan of Delicious for a long time. I maintain both a personal account and am a contributor to Central Library’s account on behalf of TELIS (telephone reference.) It comes in handy when callers need a web site fast and you know it’s bookmarked: just type in your tag and you’re there! I like that the bookmarks are not tied to the browser on a single computer, but are accessible to me no matter which computer I use. I also like the tag bundling feature. I’ve created a few bundles that I think might be useful for upcoming computer classes offered here.
Although Delicious is a social site, I have not used its social features except to link my own bookmarks with CEN’s in a network. Selfish, I guess, and maybe just a little private about my personal bookmarks.