For years I've been thinking about building a game involving 6502 programming. Something along the lines of you're stranded on a spaceship, all the critical systems have failed, and you have a pile of 6502 processors. You need to start by keeping yourself from freezing to death by building some code that keeps the environmental systems running, then you move into growing food, and ultimately into controlling the ships propulsion, communications, and navigation systems. All with programming.
Then I think that I'd be the only one that would want to play that, and shelve the idea.
Then I see something about people being interested in 6502 stuff, and think that maybe I'm not so crazy...