New Google tool - Google SideWiki

Google released a new tool a couple of weeks ago called, Google SideWiki, designed to for people to help and learn from others as you browse the web. SideWiki has been included as a feature of the Google Toolbar for FireFox and Internet Explorer and is being added to Google Chrome as well.

One of the really cool features is the ability to post to Blogger with it as well. While I haven't had a chance to try it out myself the buzz about it online is mostly positive, with a few thoughts on how to keep down the flame wars.

Have you heard of Google SideWiki? If so what do you think so far? How could it be useful in the classroom?