Already done here! I actually have a 17" now, but the idea is still there. Can't wait to get something like a 21" Sony CPD-G520.

Standard TV signals don't look quite as good on monitors as they are very blocky. I don't know if HDTV will be able to go into one. I vaguely remember something about how this was possible. DVDs still look fantastic though, even on my 3 year old Trinitron.