Definition: Sidewiki is part of Google Toolbar. It is a commenting system for the entire Web. Sidewiki is potentially on any page and visible as a sidebar you can reveal or hide as you browse. These comments are ranked by algorithm as they're posted. Furthermore, you can comment on a specific section of a Web page, and your comment will be linked to any page that quotes that snippet.
Google Toolbar with Sidewiki can be downloaded at google.com/sidewiki
