"Google Sidewiki is a browser sidebar that lets you contribute and read information alongside any web page."

* http://www.google.com/search?q=GoogleSideWiki
* http://www.google.com/search?q=SideWiki

is not (yet) a true Wiki, built on the WikiPrinciples.
But it could be made into such one with Wikis, that host GoogleSideWiki comments.

-- FridemarPache

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''http://www.google.com/sidewiki (main page)''

''http://www.google.com/sidewiki/intl/en/learnmore.html (more information)''

''Personally, this does not appeal to me.''

Why is that so:-)

For RecentChangesJunkies you might be interested in http://www.google.com/search?q=SideWikiRecentChanges. -- FridemarPache

''Is this what you tried to post?: http://www.google.com/sidewiki/entry/106004381457049451465/id/cI8DN83AOraVSFrr8U1s5ouct3U''
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For something so blindingly worthless, it's not surprising that it's being shut down.  See http://googleblog.blogspot.com/2011/09/fall-spring-clean.html

In Google's own words:

"Sidewiki: Over the past few years, we’ve seen extraordinary innovation in terms of making the web collaborative. So we’ve decided to discontinue Sidewiki and focus instead on our broader social initiatives. Sidewiki authors will be given more details about this closure in the weeks ahead, and they’ll have a number of months to download their content."

Also, see http://www.sociableblog.com/2011/11/02/google-sidewiki-closing-down/
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See also HostWikiForGoogleSideWiki SideWiki