Kudos to you for taking this on. I've been following this thread with much interest (I'm buying an iPhone at the end of the month when my Verizon contract expires).
I just came across this
http://www.pcworld.com/article/16114...ame_maker.html, which is a fun little read on app development similar to what you're going though.
I can guarantee I'll be buying your app when it's released!