Sign up with Apple to be an iPhone Developer

You can sign up to be an iPhone Developer for free. Once you have signed up you will have access to everything you need to create iPhone Apps. The iPhone Developer website is http://developer.apple.com/iphone/.

Learn iPhone App Creation from Stanford

Stanford has recently started teaching a class on iPhone app creation. They videotaped the entire semester and made it available on iTunes U for free. You can visit the class website for links to all the videos and assignments that go along with each video.

Class Website: http://www.stanford.edu/class/cs193p/cgi-bin/index.php

Get help from other developers

There is a great website where many developers post questions and answers all about making iPhone and iPod Touch apps. The website is http://www.iphonedevsdk.com, it is free to sign up and that site has really created a great community of iPhone developers.