There's an "Overscan" check-box in both PC and Mac control panels for this (if anyone reading has suffered this).

On a somewhat unrelated note anybody know how to enable overscan with a video card using VESA output under linux? I have a diamond branded card with an ATI chipset in a box I intend to use as a video server and I get just a little black on either side of the picture I would like to get rid of.

-Mike