A word of warning for anyone using MobileMe with their iPhone that is thinking of stopping the subscription (like myself).
Before allowing your account to lapse, make sure you 'Disconnect' your account from your phone.
If you don't, when your account expires you will lose from your phone anything you entered via the web portal such as contacts, appointments, reminders etc.
I know someone who found out the hard way, and they are still re-entering most of it now!