Diigo:Research and knowledge-sharing community

Diigo is a powerful research tool and a knowledge-sharing community

Diigo provides a browser add-on that can really improve your research productivity. As you read on the web, instead of just bookmarking, you can highlight portions of web pages that are of particular interest to you. You can also attach sticky notes to specific parts of web pages. Unlike most other web "highlighters" that merely clip, Diigo highlights and sticky notes are persistent in the sense that whenever you return to the original web page, you will see your highlights and sticky notes superimposed on the original page, just what you would expect if you highlighted or wrote on a book!

Moreover, all the information -- highlighted paragraphs, sticky notes, and the original url -- are saved on Diigo servers, creating your personal digest of the web, your own collection of highlights from the web - ones that are meaningful to you! You can easily search, access, sort and share this collection from any PC or even iphone. More about Diigo