The iPhone has everything except a keyboard and a good camera.
The Blackberry is a texting/business phone. The biggest flaw is the lack of Wi-Fi.
If you want a flip phone with a keyboard then get a sidekick. Also the cheapest out of the three.
I don't know enough about the mytouch. I don't even know anybody who has one.
I think I would spring for the iPhone.
ATT sucks but IPhones are the &$#%#&@!.