Gizmodo channels some news about T-Mobile's pending 3G efforts here in the USA.
If they are anything like what I've experienced in London, AT&T will have a run for their money here. T-Mo is farther ahead in integration between devices and network. Their approach has been long tail, not short tail. It has also been consistent and while they have had to make due with the poky EDGE network, they have always been willing to make data a part of their network, not be treating it like second rate stepchildren.
With the kind of coverage they are proposing to have it will give Verizon a run for the money in most coverage and likely be the first real consumer marketed service taken to the masses. For the most part Sprint, Verizon and AT&T have been aiming their 3G services at the business or prosumer user.