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The ThirdVoice concept just will not die. Reframe It lets you highlight a piece of a Web page, comment on it, and discuss those comments with other visitors.
Four companies at TechCrunch50 aim to lower information overload, but they approach the problem in different ways.
Stickis is a new service that lets you attach little sticky-type notes to Web pages you visit, and lets you view the notes other people have left on pages.
Diigo: bookmarking evolved