Apple now seems to be allowing non-developer accounts migrate their MobileMe to iCloud. I have just done mine and its all up and running perfectly on windows pc, iPhone 4 iOS 5 and iPad 2 iOS 5.
How To:
Sign into your MobileMe account at Me.com, then visit MobileMe.com/move and follow the instructions.
Done!
How To:
Sign into your MobileMe account at Me.com, then visit MobileMe.com/move and follow the instructions.
Done!