I'm running the Windows 7 Beta build 7000 on an HP Pavilion zd8000 laptop. Pentium 4 3.0ghz, 2GB ram, and ATI Raedon Mobility x600 graphics chip with 256MB dedicated memory.
This morning my display was running just fine at 1650x1080, 32-bit color. After installing iTunes 8.1 and restarting...