One of my buddies was telling me about how he is setting up a Raspberry Pi to play old video games. I thought it was a great idea, and much cheaper than buying up all the old systems (which I do have, but sometimes I don't feel like going into the basement). If you ever wondered how it works, check out this video from Life Hacker.
By the way, don't bother asking me about ROMs. That's not my problem =)