Wirelessly posted (iPhone: Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16)
Not since Apple has added find my iPhone and remote wipe.
No. My MobileMe email address is my primary email address and has been for the past 2 years. I couldn't lose that. Also, Apple keeps adding things that make it more and more worth the money each year. I'll gladly keep paying if Apple keeps improving and adding to the service.
Push Gmail is already available through Nuevasync for only $25 a year. I've been using Gmail for years but I switched to MobileMe because it was designed specifically for the Mac and the iPhone. Syncing of bookmarks, iDisk, and the ability to publish photos from the iPhone directly to MobileMe are some of the other features that Google doesn't have, at least not natively on the iPhone.