Google have announced Knol, a collection of authoritative articles, written by a community of experts. After having a quick look at it, and reading comments from other bloggers, it is a site to watch in future, but not of immediate interest. The content is naturally very limited and much of this is medical. Despite the naming of authors, sometimes with credentials, it is hard to see the articles having sufficient authority to be recommendable. Maybe a student class could be given an assignment to compare an article between Knol, Wikipedia and Britannica in due course.
For more comment see ReadWrite Web.