http://blogs.pcworld.com/techlog/archives/006072.html

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To quote

“Another day, another announcement of a Google service that competes with something (or somethings) already out there, with a twist. This time, it’s Google Knol, a place for experts to write authoritative articles on topics of all sorts, complete with photos, subsections, and footnotes.

At first blush, Knol sounds a lot like Wikipedia, and this screenshot looks an awful lot like it, too. But it has one significant difference: While Wikipedia is the creation of armies of creators working in anonymity or obscurity, Knol–the name means “unit of knowledge” will spotlight individual authors, let them retain ownership of their content, and divvy up any advertising revenue with them.”