Motorola was showing off the MPx in both the Microsoft booth and in their booth. It's pretty amazing to switch the orientation from one direction to the other. Here's a picture of it in the vertical orientation. Very, very clean design. The keys have a nice responsiveness. The unit feels very solid. On the other hand it's bigger than would be ideal and the keyboard layout is a bit of a compromise. None-the-less I think we'll be seeing a lot of these around come spring.
On a semi-related note, the Razr was everywhere at the show. I just couldn't believe how many of the attendees were already carrying one. This is going to be a huge hit for Moto.