I've spent a fair amount of time playing around with emulators. I like the recent trend of adding extra functionality to certain systems. By this I mean things like UberNES and lua scripting for FCEUX. Also the multiplayer hack for F zero seems pretty cool.
I have some nes and snes on my backup drive. Vista whines too much or I'd have them installed.
Never before have I said you need a decent graphics card to play Nintendo.