Mine comes out of it ok as long as I don't use the DreamScape backgrounds. They BSOD whenever I come back from sleep.
(X2 4400/DFI Ultra-D/2GB pc3200/BFG 8800GTS/Audigy2 Platinum/Vista Ultimate)
Check and make sure your drivers are all working and updated (as well as they can) for things like soundcard, and make sure all your devices (like keyboard and mouse) don't have the ability to "wake up from sleep." (You can check that in the device manager)
BTW, if you have Ultimate, are you getting flickering with your 8800 when playing poker too?