This is absolutely bizarre... every time I boot into or reboot Windows 7 Professional, it forgets that I told it to extend my desktop onto my second monitor. Extended desktop mode works just fine - I can enable it from the Control Panel, and it'll stick until the next reboot. It also works without issue in the Mac OS X environment. I'm running Snow Leopard (10.6.1) and using the Boot Camp 3.0 drivers. Anyone else have this problem?