Yes, I know I said not to mention Mobile Me but that's only because it is the obvious solution.

Seems to be the best coupled with the passcode feature.

Through my research yesterday the main shortcoming of MM is that if the person in possession of the handset yanks the SIM or disables your MM resident push email account you're out of luck.

The passcode feature seemingly guards against disable leaving the SIM yank as the obvious security hole.

Will be signing up for MM today. Should have done it yesterday but didn't have my CC with me at the pool in BKK

Actually should have done it when the feature was made available ;(