So I just completed my second iPhone application (which is waiting for apples approval) and now I want to go forward. While utility applications are easy to make, they don't produce a lot of $$$ (I sold only 36 versions of my first app). So I was thinking about making a game - I have two great ideas that haven't been implemented on iphone yet and of course I want to get that idea to reality. Problem is where to start? Any good book? I found a cocos2d for iphone (a nice framework) that should probably be good to start. But I also want to make some OSX graphic apps so cocos2d isn't good for that. So any ideas?