I spent a little time at the AT&T booth here at the Moscone Center and chatted with a rep about their current flagship smartphone, the HTC-made Tilt.  In true HTC tradition, the Tilt has a great QWERTY keyboard, and solid, solid feel to it.  AT&T told me the response to this WinMob powerhouse has been great, with people responding really favorably to the keypad and integrated GPS in particular.

The tilting screen is actually pretty handy - you can leave it flat like other HTC slideout phones (Mogul, Wing, etc) or tilt it towards you for more of a mini-laptop feel.  Backed by a zippy processor, 3 MP camera, Wi-Fi, and 3G data speeds, the Tilt is arguably the best all around smartphone currently made for use in the US. 

At least until those new i-Mate Ultimates start shipping ...