I am also a proud owner of an Addams Family pinball machine, though it needs some TLC. It's missing a ball and none of the solenoids powered up last time I turned it on. I am thrilled to own it, and to put the money and effort into restoring it to fully working condition.
In short, no. I was looking into it myself, and the ipod uses a strange formatting. Seems to me you can't even buy a 40gb ipod and take the hard drive out and put that in your 20gb (no point, either). The security Apple uses has not yet been cracked.