Navagon: Planescape Torment - Recently re-released as a retail boxed version. Works fine in Windows 7 64bit even with all the mods. Atari is here, but because of a legal battle with Hasbro, GOG need Hasbro's consent too. Plus Interplay still seem to figure into the picture somewhere. All in all it's more confused than a neo nazi at a black pride rally.
HOLY CRAP!!! I just checked Amazon and it's there. Does anyone have first-hand experience of how Planescape:Torment runs on Windows XP? I played about 10 hours into a pirated version a while back and had to give up when I shifted the character over to using magic. Everytime I used a spell the effects for it stalled the game up for a few minutes, making it pretty much unplayable. I had to give up even though I wanted to finish the game. I'd definitely start over and play it through if I was guaranteed it was working/patched version. The story and setting are really awesome, it totally draws you in despite the dated graphics.