I ditched my iPhone, in favor of a T-Mobile Blackberry 8900. The iphone is sleek toy and superior to the 8900 only its interface to play music and video. Still, I have 16Gigs of memory on my 8900 which will hold much more video for a lower price than the iPhone.
The major downside of the iphone became apparent to me after a few months of use, the very inferior email interface, the lock-in to AT&T service.
Anyone who makes a living based on response time to emailed contacts must agree, the blackberry is a far superior device.