Overscan is a throwback to the days of CRT TVs and should have no place in today's TVs, but for a reason I cannot fathom it's often on by default. Whenever I get a new TV I always disable overscan as it makes no sense to watch cropped images.
The only cropping which we get these days is SD compressed by MPEG-4, but nothing we can do about that.
Just received my new Sammy 50 and with all the video output windows ticked the picture is superb ,only one small complaint if you do happen to be on a lower Res channel then the TV guide will look terrible . I couldn't tick all the boxes with the old Sony bravia as it just couldn't handle it when switching channel ,it went haywire basically blinking constantly .Ok now tho .good thread .