"Over the years, numerous companies have offered services that allowed users to annotate web pages. Now, with a new project called Sidewiki, Google is going to join the fray as well. Sidewiki, which will be distributed with a special version of the Google Toolbar for Firefox and Internet Explorer, allows users to publicly annotate any page on the web. Entries will then be sorted by an algorithm that filters out low-quality comments and moves the most interesting items to the top.
The sorting algorithm and Sidewiki's ability to display notes about the same topic on various sites make Sidewiki somewhat unique. Google uses a quote from a speech by President Obama as an example here. Sidewiki will recognize the quote on multiple sites and aggregate them together, no matter whether somebody commented on this quote on Little Green Footballs or Daily Kos. You can also leave a comment about the entire page, of course.
For some popular sites that haven't been annotated yet, Google will also pop up a notification that comments exist, but the sidebar will actually be filled with related blog posts, which is another feature that makes Google stand out from the competition in this field."...
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