Google rolled out Knol, this new project with a not-so-sexy name is a repository or authoritative articles about a specific topic. It's a bit like Wikipedia but there's one big difference; you can't publish articles anonymously and you need to have credentials.
The Knol project is a site that hosts many knols — units of knowledge — written about various subjects. The authors of the knols can take credit for their writing, provide credentials, and elicit peer reviews and comments. Users can provide feedback, comments, related information. So the Knol project is a platform for sharing information, with multiple cues that help you evaluate the quality and veracity of information.