Strobe lighted track ball is the coolest one I've heard yet. I was thinking about how cool it would be to rent one of those giant presentation halls, and use the LCD projector to play Mame on, maybe bribe the janitor of my school or somethin. Also I thought about what it would be like to have carpet on everything except the control panel part, because then if you people loungin around, they could lean on your cabinet and what not.
I just thought of something interesting, why not put two of those "drink" holders on the top sides of your arcade machine, and get those straws like on those beer hats coming down the side of the cabinet, so you could drink "soda" and play at the same time. I think I'm going to do this one, but having one of those keyboards with the Frequency wireless things on em, so you can just leave the keyboard on the side of the control panel until you need it.
-cool ideas all
-CthulhuLuke