For your information, there is a mod that can be used on newer machines to play the game with a much larger resolution (making it look much better than at its native resolution).
Widescreen Mod->You should set the values at x=1280 and y=800 (it works better with the UI mod below at this resolution).
GhostDog's PS:T UI mod v2.1->I'd like to point out that there is an option to have much larger fonts (up to +120%). Since there is a lot of reading to be done in this game, bigger fonts means much less strain on your eyes.
This should help players who want to discover or rediscover Planescape: Torment.
Screenshot.