I tried to migrate to the new version of Blogger. It thought and thought and thought and then told me it couldn't migrate me right now and I should try later. No worries. However, now, when I try to leave comments on other Blogger blogs, like Justin's, where the owner has managed to migrate, Blogger tells me it doesn't know who I am and cannot recognize my log in information!
Update Rose of Sharon has the same problem. She's got a pretty funny post about it, too.