Some games actually render to the overscanned area (seems to be games that had a quick PAL release following the NTSC release, I guess so they don't have to alter the resolution once they translate it?) while some will just render a smaller image. Most of my games do render to the overscanned area, but I've noticed some, like Burnout 3, don't bother drawing any pixels in the area that's typically overscanned.
BTW, there's always the option to go with the TV of your dreams (for the money) and then get an external scaler.
BTW, there's always the option to go with the TV of your dreams (for the money) and then get an external scaler.