Diigo - Web Highlighter and Sticky Notes, Online Bookmarking and Annotation, Personal Learning Network. (via Mowser)

Research Annotate, Archive, Organize

Online bookmark: Organize by tags or lists; Access from anywhere, anytime! Archive: Do not just bookmark! Archive pages forever! Make them searchable too!

Annotate: Do not just archive! Highlight! Add sticky notes too!

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Share Build Personal Learning Network

Share your annotated pages with your followers on Diigo or elsewhere. Get a stream of interesting content by following others you like. Interact with others on content of interest. Learn more »

Collaborate Create a Group Knowledge Repository

Create a private or public group for your company, class, and teams. Share findings to the group -- make it the second brain for your team! Interact on the web pages in-situ or in the group. Learn more »

Educator Accounts - a free premium account especially designed for educators.

Testimonials

"It would be easy to dismiss Diigo as yet-another social bookmarking tool, but that would be a big mistake. Diigo's highlighting, bookmarking and site sharing tools are a subset of features in a rich collaborative application that puts information discovery and the writable Web at the center of discussions among colleagues, friends, and like-minded people. Diigo represents a move to maturity in the Web 2.0; it is a business tool, leveraging social models to deliver real value to its users." ~ Chris Shipley, executive producer of DEMO