Google at long last opens Knol to the world - hoping to attract those who like to work for free or very little before the big rush of information hungry knol seekers sets in. Some people see this as a competitor to Wikipedia. I believe it's more like those sites - mainly disappeared from sight now - which offered a PR X link for some random article.
Here's what Knol itself has to say about Wikipedia. And here's what Wikipedia knows about Knol.
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