Nokia N95 8GB
Forget any rumors you might have heard.
At one point on their website they even had a banner saying that they would not "sell out" and that they wanted to keep the market "free" for unlocked data phones.
Besides... If AT&T were interested in picking it up they would have done so already... besides... why would they want to kill their iPhone? T-Mobile wont because it runs off AT&T 3G and not their own.