For those who want to make 2D game for iphone you can consider cocos2d framework at http://code.google.com/p/cocos2d-iphone/

The coding is much more simpler and easy to understand if you study through samples that come in the zip file.

By the way im currently creating an iphone game with 3 other friends. It's called Shaolin Is Awesome!!!

^^ you can try the torque iphone engine from www.garagegames.com. I read from requirement page that you can use windows to develop iphone game.

however i read some comment from somewhere before that in the end you still need mac os to port your game to iphone or itouch to test your game on the device.. but dont take my word for it.

btw the torque iphone is pricey at USD500 plus you need to have the TGH pro engine before you can run the torque iphone which is another USD250.

One alternative way is to run mac os on your 'PC'. I tried that before and install the iphone sdk and it runs!! However i couldn't find a complete drivers for my pc so it was a bit messy using the mac os on my pc so i went and bought a macbook pro later on..