For some reason, lately when I'm in Windows 7 using Boot Camp and I want to restart back into OS X, it'll restart back into Windows 7 again.
What I do is, I click on the Boot Camp system tray icon and click on "Restart in Mac OS X", and about 25% of the time it will restart back into Windows. This happens less frequently if I wait for all applications in Windows to settle down (such as when closing Firefox, it takes a few seconds, so I have to wait for that to close completely) before restarting, and that seems to help. However, I didn't need to do this before.
Anyone know what's going on here, and how I can fix it?