M.U.L.E., originally on the Commodore 64, is one of the greatest games of all time. I would pay for a direct port of the original game onto the iPad (with the addition of touchscreen joystick control, of course. Someone needs to get on this!
A friend of mine and I have been hooked on M.U.L.E. since 1988. My wife for the life of her couldn't understand the appeal and she's by no means a "gamer" but after trying it out a few months ago she's hooked too and we play nearly every night! This game is a blast, it's addictive, and making it multiplayer on the iPad and iPhone would = a very successful app for somebody.
It looks like it's finally happening. A company called Elite Systems is releasing an app with 12 games that includes MULE! It'll be released this Saturday and I can't wait! Unfortunately I'm a noob on this forum and can't add the link, but you can find the press release at Elite Systems site. And just do a search for Elite Collection in the App Store starting Saturday.
