I think we'll see more and more Guest Posts with quality content in the future. To me at least, it looks like Arrington is setting up the company for a future sale, and since right now Techcrunch=Arrington, he has to distance himself from writing. So that leaves a lot of free space that they need to fill up.

What makes you say they're gearing up to flip?

Companies tend to avoid things that rely heavily on one "superstar", by stepping out of the limelight, Arrington is making Techcrunch stand on its own