Sidewiki

Sidewiki is valuable if you wish to interact with certain websites, wish to cut/paste material from the web, and/or have multiple blogs.

"Google Sidewiki is a browser sidebar that enables you to contribute and read helpful information alongside any web page. It is available as a feature in Google Toolbar.
To get started, simply download the latest version of Google Toolbar and enable the Sidewiki button in the Toolbar Options menu. Learn more about enabling Sidewiki. "