Our bro's over at Station-Drivers send word that they've snagged a set of ATi Catalyst 6.12 Beta drivers for Windows 2000/XP (32/64bits) and Windows Media Center! Dated 09/11/2006 Looks like there's a GPU on the way the Radeon X1050 that's listed in the Inf file.

All Cards Supported Radeon & Radeon Mobility

Download: ATI Catalyst 6.12 Beta for Windows 32/64bits