I really like the fact that you guys make it so the games on this site work with Windows XP and Vista... but I've found that the bigger problem isn't the backwards compatibility of OSes, but of graphics card.
For example, I actually own Descent 3 myself, and found weird problems with textures turning invisible on me when I try to run it on my newer computer. Are there plans to improve compatibility with newer hardware as well?
EDIT: Likewise, one of my favorite games, Planescape: Torment particularly has problems rendering the spell effects on newer hardware (despite being pre-rendered to begin with). It would be nice to have an updated version where the spells can be appreciated in their original glory.

I found a complete box-copy of Descent 3. Registration card and everything. I have yet to get it working on any modern nVidia card.

Crimson Skies has issues with modern NVIDIA cards-heck, it was broken back in the 6800 days thanks to their craptastic drivers! Text appears as a garbled checkerboard, and the game will probably crash if you play for too long. It's supposedly due to the use of non-power-of-two textures, which also seems to have broken Dark Engine games (Thief I and II, System Shock 2).
Heavy Gear II also has rendering issues on my 8800 GT, though the menus are still readable and the game has yet to crash abruptly. Specifically, the terrain isn't culled properly, so you see things that should be behind the edge of a cliff or a hill. If it weren't for that, I'd play it a lot more.
I'll have an opportunity to test out an HD Radeon 4850 soon, though. Maybe ATI's drivers don't suck in the backwards compatibility department as much, even though I'll probably want to go running back to NVIDIA any time the topic of Linux gets brought up.

Infinity Engine based games don't like modern graphics cards.
Those games are:
--Planescape: Torment
--BG series
--Icewind Dale series
Before you boot any of those games, do the following (at least in Windows XP; not sure how much different it might be in Windows Vista):
--Right click on Desktop
--On drop down menu, click Properties
--Go into your Display Properties
--Click on Settings tab
--Click Advanced
--Click Troubleshoot
--Turn Hardware Acceleration (of your vid card) down to NONE
--Apply these settings
Problem solved. Since all of these games do not require a vid card at all to run, this is the easy solution (currently). PS:T and any of those old Infinity Engine games should run fine any time you run them, with Vidcard's Hardware Acceleration turned off.
Of course, obviously, any time you want to play a modern game, follow my above steps but instead turn Hardware Acceleration back on. :oP
Hope that helps you at least get the game working as it once did.

That's odd, MysterD. Baldur's Gate,and Icewind Dale work just fine. Planescape: Tourment is the only one I've had issues with.

lalala im stupid

Just curious, which gfx card are you using?

You guys are really making me want to check if my retail copy of Decent 3 works with my new video card, it worked with the my GeForce 7800 in my last machine. The only game I know is unplayable due my video card (GeForce 9800GTX) is Dark Reign 2, and it wouldn't display properly on the 7800 either. All the textures are garbled, and polygons stretch into infinity in some places.

Just run dxdiag on the "run" command.
There, you will be able to set the graphic settings.
As above mentioned, disable any 3D acceleration that may impact all old 2D games.
This can be tedious, but it is normally possible with any OS using directX.

Interesting.
I run Win XP Home, 3.2 Ghz with HT, 512 MB of Nvidia GF 8800 GT (with newest WHQL drivers) and 2 GB of RAM.
Turning off the vid card's hardware acceleration gets my copies of both Icewind Dale 1 and 2 and Planescape: Torment from experiencing any odd graphical issues of the game entirely freezing and framerate-drops when spellcasting -- b/c yes, I do have these installed on that above-listed PC and do now and then play them.
Never tried for BG series on this newer rig, though -- but I do know this has helped for many other people who've had issues w/ BG series on newer PC's. BG's a great game, which I did play on my much older PC, quite some time back.

Well, I haven't tried it on my new computer, but I remember even having problems with it as far back as on my old computer which had a GeForce 4 MX420. I imagine my much newer, faster rig (Athalon XP 3800 w/ GeForce 8800GT) will likewise have problems.