laptop 1280x800 (widescreen)
main pc 1680x1050 (widescreen lcd) + 1024x768 (second lcd)
second pc 1152x864 + 1152x864 (dual 19inch monitors)
yes i love dual monitor setups, i even have 2 x 17inch monitors at work
keeping the game resolution the same as the desktop is a great idea
(although the scrolling of the BoA map is sluggish at 1680x1050)
but also give the user the ability to choose the resolution to have the control, for the ultimate flexability have a setup menu with some common resolutions for the non-techies people and user defined settings for the techies.
dual monitor support would be nice but having control over the resolution is much more important