There seems to be no limit to the places videogames will show up. Especially Doom. Now if you have an iPod Nano you can use it to play the game. If you're enough of a Doom fan to want it on your nano, I'm not sure why you wouldn't just put it on a real gaming device. But then again, as a tech addict it's enough to simply say "...because I could!"
Be warned that it might void your warranty, and you'll need iPodLinux
. Check out details at iDoom
Related: Playing Doom on Apple's iPod