The problem we were seeing with movie DVD playback has been fixed! NVidia released a Windows 7 driver update for the GeForce 6200 video card in late February. I installed it two weeks ago and we haven’t had any problems with DVD playback since.
I’ve got four computers at home now running Windows 7. A number of these are dual boot machines that can dual boot into Vista or Windows 7. I’m finding it harder and harder to boot back into Vista. The performance and reliability of Windows 7 has been great so far (other than the Media Center issues) and I have really adapted to the new taskbar. I’m looking forward to the final release!