User-generated content v. professional content on the web

A few recent articles discuss the swings between user-generated content and professional content on the web and emerging hybrid forms as well...

In "Revenge of the Experts" from Newsweek.com (March 6, 2008):

• Google is testing "Knol", a Wikipedia-like site (with ads) that uses 'authoritative' authors.
• BigThink.com is the "YouTube for ideas" backed by former Harvard president Larry Summers (see previous post, Jan 7 2008).

In "The Experts vs. the Amateurs: A Tug of War Over the Future of Media" from the Knowledge@Wharton newsletter (March 19, 2008), experts at Wharton express different views on where the pendulum sits in the swing between user-generated and professional content on the web.

This merging of media forms has implications for research, education, business...