#3, Do not use overscan of any kind.
Instead, find out what resolutions your display will support on the input being used and set your video card to use that resolution at 60Hz. If the HDTV itself uses overscan, turn it off.
OverScan/Underscan options may be adjusted inside Nvidia's control panel - toggle to the advanced view.
Also, if you are using Windows Media Center, you can adjust the TV image display and enable some very effective scalers to fill the screen without distorting, or clipping the image in standard definition. In WMC, or MCE 2005, just use the "Info" button on the remote, or applicable keyboard, or right-click the interface and select "Zoom" toggle through the options that work best for your signal and wide format TV. ****This way you can tune for the computer display and native resolutions that work best, and still adjust the TV display format after you have done set up the TV as a computer display first.
For guys with 720P only HDTV, use 1280 x 720 to get at least one mega-pixel, which is also what works best for 32" to 42" HDTV's from 8 to 10 feet from the display - if one goes higher than that, count on killing any kind of use as a PC - say for group Internet browsing - you can however, maintain and use higher/different resolutions for gaming and BD/HD DVD viewing.
Finally, be careful with some HDTV's that do have VGA support - all but the very high end full HD units only support 1024 768 screen resolutions on the VGA port.
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