Diigo--powerful annotation tool for websites

Diigo is a powerful annotation tool that enables bookmark, highlight, capture, etc. on websites. It is easy to locate and retrieve information we have saved while browsing websites. Diigo can help us save time and stay organized in this overloaded information era.
The group feature of Diigo can facilitate collaboration on projects and sharing information.

Here is a tutorial of Diigo from Lynda.com: