Diigo Web Collector

Diigo Bookmark, Archive, Highlight and Sticky-Note is an extension for Google Chrome. Highlight webpages with multiple colors as you read online. Also allow tagging and sticky notes. With this extension you can attach highlights and stickies to a webpage as a reminder, share pages with annotation via Twitter, Facebook, and Google Buzz, create groups to pool findings and share resources or curate content, and bookmark links to archive webpages or to read later.

Requirements:

Google Chrome Beta Channel