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...