Suggestion, and a big time suggestion at that that may turn the fate of b2 forever. maybe not.

How about a migration from Greymatter to b2? What this will do is to parse the Greymatter entry files and convert them into b2. Sounds easy, but the programming involved is tough, I think. For Blogger, the process could be slightly easier, with XML-RPC, all we need to do is strip the XML code and introduce it into b2.