I am sure this is more than likely old news to most here, but there is a mod that lets you run these games at resolutions up to 1900x1200.
I just tried it with PS:T on Win 7 and it is working great. Here is the link.
http://www.gibberlings3.net/widescreen/
Posts
This link might be useful, it's a step by step guide to getting a lot of the common community fix packs and so on applied:
http://thunderpeel2001.blogspot.com/2009/01/planescape-torment-fully-modded.html
It looks incredible, here is a screenie at 1920x1080
Compared to how great the Icewind Dale games will look now, i'd say that's a fair tradeoff. I look forward to trying this out.