The first data (smartphone actually) device that Cingular will have that is UMTS is a Samsung product. I believe the BB stuff will start early next year. FWIW (I haven't been a member long enough to know if this is previously posted so I apologize if I am restating the obvious), UMTS / HSDPA is a CDMA based technology. Current GSM technology is not capable of the speeds that can be achieved with UMTS / HSDPA.
Hit me at the hip!