March 06; useful discursive comparison by judges of top contenders in each of many categories, which rhetorically can be used to teach students how to write about the Internet; sizeable honorable mention lists
You sign up, enter the name of a book, then find out what other folks who liked that book also liked; a tag cloud for the book leads to other books on this topic. Quite addictive, and I just used it to look at the info. around one book.
New Ajax social bookmark URL(you can see with what tags one have bookmarked you) and tag search. Says it will be adding more social bookmarking query services almost daily.
A search engine that searches Clipmarks, Creative Mobs, Jots, Shadows, Unalog, Ma.gnlia, Wists... You can also search one social bookmarks by typing: http://gada.be/jots/tag or http://gada.be/digg/tag etc...