Is this something I should try to market to potential clients? Cutting edge vs. tested & reliable web design?
Rafe Needleman has been on the Web 2.0 beat and I'm going to try to get him on to discuss where it's all going, what it means, and whether O'reilly can really service mark it.
What else would you like to hear about Web 2.1?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic