Microsoft wont compete with handhelds. They have allowed Rare to make games on Gameboy Advances in the past like Banjo-Kazooie Gruntys Revenge and Conkers Pocket Tails. Nintendo have and will continue to dominate that market. Im surprise Sony still try to compete. It is a losing battle. If anything MS will use there Nokia Windows Phones as there handheld gaming devices. They wont make a Xbox Pocket (whatever) as a seperate device. Multifuntion devices is MS's vision.