This may sound like a dumb thing to ask, but I've never bought anything from gog.com before and I was wondering...
Will Fallout 1 (and 2, and Tactics, I suppose) work on a current machine (Vista x64)? I've never been able to get the old Fallouts working without having color issues (the color pallets got jumbled or something and it wouldn't draw the screen correctly). I noticed how cheap they were here and I figured for that price I wouldn't mind paying for them again, but I have to know if the problems I had from my original copies have been fixed in this release or not.

I couldn't find a single game (from my selection) that doesn't work on Windows 7 x64. Both Fallouts work on Vista and 7 without problems.
The color issues you mentioned before happened on a Vista 32-bit laptop I had at work, but a quick restart of the game ussually fixed everything.