I dont know if any of you used BBS's before the internet became popular, but there was an awesome "door game" called Legend of The Red Dragon.
It died along with BBS's, but they made a new internet version, Legend of the GREEN Dragon, which would make (in my opinion) an awesome app to allow for multi-player gameplay.
I have no knowledge at all about programing and such, which I why I make my suggestion here. Shouldnt be too hard tho, simply resizing the display to fit on the iphone ....