Hi,
I've recently come across an interesting iPhone strategy racing app called 'Vector Rally' - I've been talking to the dev who's making it and trying to persuade him to make it into a fully fledged 'sim' as I know a few of you chaps were discussing the possibility of racing sims recently.
The game itself is based on a pen and paper turn based race game and if you want to check it out then take a look at:
Vector Rally for iPhone, iPod touch, and iPad on the iTunes App Store