Ideally you could set your LCD TV's screen to any multiple of the incoming signal like you can with your graphic cards software or Powerstrip.

But I can't see manufactures putting that feature on a TV set,as most people can't even set up a TV properly,they tend to whack all the video controls to around the 75% mark and wonder why they have a crappy picture.

I have two friends that both bought SONY Bravia set's at the same time, both only having a very basic understanding of video settings and controls,both had asked me to come around to set the sets up.
The first was playing his PS3 on it when I went around and was saying how much better it looked on the new set.
I took one look at and realized he hadn't changed the output settings on the PS3 so it was still in SD,he though it was HD

The picture was still crap,he had every video processing control turned on and others set at 75%,video artifacts everywhere.

About 30 minutes "Undoing" his setup and another 30 spent with a test DVD and writing down what each setting should be next the each controls description in his TV's manual [so he couldn't stuff it up again], all was looking very nice indeed