This was left for us earlier today in the comments:
You may or may not know this but Apple and Stanford are offering free iPhone development courses online http://www.engadget.com/2009/04/03/apple-and-stanford-to-offer-free-iphone-development-courses-onli/
And it’s true. The whole thing was available in PDF form. I hadn’t even thought about it until just now (thank you Chuck), so I’m gonna go download the course again at
http://www.mobileorchard.com/take-stanfords-iphone-programming-class-for-free