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“Diigo (dee'go) is about "Social Annotation". By combining social bookmarking, clippings, in situ annotation, tagging, full-text search, easy sharing and interactions, Diigo offers a powerful personal tool and a rich social platform for knowledge users, and in the process, turns the entire web into a writable, participatory and interactive media.

Why it might be a killer: It combines features from a bunch of different sites into one thing, and all of these features work really well together. The ease with which you can add your content to blogs is really useful, and if students get word of this, it will make their lives writing papers and studying for their different subjects so much easier. When Diigo is criticized on blogs, there is a dedicated base of users that attack the bad review with proof of the site’s worth, which makes it hard to argue with.