ATI RADEON XPRESS 200 128MB 400mhz [??]
ATI RADEON X300 [not working, tested]
ATO RADEON 7000 [untested, possible will work]
Nvidia FX5200 [gold] nvidia driver version 61.77
Nvidia GT6600 [gold] nvidia driver version 61.77
ATI RADEON MOBILITY 9000 [gold]
ATI Radeon 9500 - 9800 (including 9550, 9600 etc) will provide you with the best experience on Longhorn (they perfectly work with early DCE in 3718, and DWM in 4066 / 4074).
ATI Radeon 9700 [gold]
ATI Radeon 9800 Pro [gold]