As most full-hd panels, my plasma is also 1080p (1980x1080 pixels)
I found out that using Windows on this resolution from viewing distance is no joy at all, and almost impossible without binoculars, so my htpc is default set on 720p (1280x720) looking great.
For playing full hd movie content, the gain from 720p to 1080p is there, but in my opinion quite overrated.
Best thing would be to make it possible to choose or overrule the resolution. Computer displays will often have other resolutions AND ratio's.
(most of all very happy this idea is being picked-up so fast and enthusiastically!)