Are you using Google Sidewiki?

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I just installed the Google Toolbar, and it came with a new feature called Google Sidewiki. It's a browser sidebar that let the users contribute and read information alongside any web page. It's another new invention by Google?It seems like we can write an entry about any web page, and when others browse the web page, they will be able to see the comments. It seems interesting as we can always see others' comments on certain web pages, but not only the creators'. Have you heard about Google Sidewiki? Or have you used it before? Do you like it?