Google introduces Knol, which may not actually existGoogle introduced Knol to the public yesterday. It's a sort-of About.com meets Wikipedia, and could smash all of Jason Calacanis's Mahalo dreams. Or at least, the sort-of introduced Knol could. If we ever hear about it again.

"Google stressed to me that what's shown in the screenshots it provided might change and that the service might not launch at all," Danny Sullivan writes on Search Engine Land. So breathe easier, Jason. Google should soon discover that Mahalo clones are just as bad an idea as the original.