The most current book on the subject is "Beginning iPhone Development" by Dave Mark and Jeff LaMarche. This will probably go a little more in depth than you'll be looking for, however. A slightly older but also well-reviewed book is "The iPhone Developer's Cookbook" by Erica Sadun.
According to Amazon. Com, a new O'Reilly book called iPhone SDK will be available on January 15. If you're looking for some free tips, here are a couple websites that detail the iPhone app-building process: http://www.ddj.com/mobile/212201481 and http://www.tuaw.com/2007/08/23/create-your-own-iphone-remote-application.
That depends on your background. Are you a C++ or Java programmer? Have you developed applications on Mac OS X before?
I'd imagine that the SDK has plenty of documentation. Go ahead, sign up for it, read through what they send you and if you still need a book, head over to amazon. I do know that there's a hefty NDA that goes along with the SDK, so there's a real dearth of web sites devoted to helping developers bang out their bugs.
Ok, so a student membership is $99 for ADC ... a book might be cheaper to get started! But, you're going to have to pay the $499 before you release you app on the app store.
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