Have you guys used the AsTray software yet? It's supposed to enable 640x480, 900x540, 1000x600 resolutions on the EEE in Windows. They're somewhat enthusiastic about it at EEEusers, but I'm hoping to see what you guys think before picking up a 7" model.
AsTray Plus
http://forum.eeeuser.com/viewtopic.php?id=18260
AsTray Plus
http://forum.eeeuser.com/viewtopic.php?id=18260