I think that the UMPC star in this CES has been the Medion UMPC.
It has been sharing the show with the OQO 02. The Medion should hit the market in about two or three weeks coinciding with Vista release. You can find more details about this UMPC at JKonTheRun where Kevin has posted a mini Review. I really like the design of this UMPC, so far it's the only design with keyboard that I like.