Okay, yeah, I know, this has been discussed before; sorry for being a noob.
However, I really think that an Avernum port for the iPhoneOS could work, at least with a few workarounds and maybe a new, smaller tileset. I mean, there is a successful Nethack port, there is a Battle for Wesnoth port (also kinda-successful)...
Oh, and don't go and start flaming Apple, the truth is that both them and Microsoft suck! :3