Does anyone know of any tutorials or books that discuss writing games for online-play. I'm mostly interested in turn-based games. Such as playing Chess or Reversi or Poker vs. an opponent anywhere in the world.

I'm looking for anything, either "general" theory, or actual example code.

I assume I'd need to have something running on a webserver somewhere and the two iPhones send their turn-data back and forth to the server, which has to manage all the games currently being played in the world. I program PHP/MySQL websites for a living, so that's not an issue. Just looking to see if anyone's willing to share how they did it.

Thanks,
Greg

*bump*

Nobody here has ever done an online, head-to-head game? Or has even thought about it?

Have you checked out the GameKit sample code on ADC site?

I saw that they had an article about using the new Bluetooth connectivity, but I didn't see anything regarding how to create "over the web" apps.