I have been having issues as well the past few days with MobileMe. My thinking was it had nothing to do with the 2.1 firmware and it was simply MobileMe acting up. According to what I've read today, the issue is cleared up now and it was a MobileMe issue.
I am still waiting for a way to get AOL to push, was hopng 2.1 would provide something. However to answer the original posters question I have heard people having problems as well and I think it is a mail2web problem.