• The Best Web Annotation Service: Add highlights and sticky notes on any web page, anywhere, and access them anywhere.
• A Great Webpage Clipping Tool: Highlighted portions of any webpage are clipped and collected centrally, which can be shared and searched.
• An All-in-One Bookmarking Tool: Bookmark webpages to Diigo, local folder, del.icio.us , Simpy, Furl, Spurl... and make them permanently cached and full-text searchable.
• A Powerful Blogging Platform: Annotate webpages and quickly turn them into blogs with a built-in blog editor or enhanced linkrolls.
• A Great Collaborative Platform: Share and interact on online findings, complete with highlights and sticky notes, with group of colleagues, classmates, or anyone who share similar interests.
• The Most Customizable Search Tool: Like Google's toolbar, but far more customizable, so you can access any search service with one-click --- music, maps, references, local library, New York Times, ...
• Unique Content Selection Menu: Interact with any word on a webpage just by selecting it, no click needed! - highlight, search, look up - whatever you want!

Find the features overwhelming?
Don't worry - it only takes a minute to get started, and everything is customizable, so you can make it work the way you want