If you're anxious to develop your own iPhone app, don't know where to start, and find high-pedigree university instruction appealing, consider learning the art of the iPhone from Stanford University. You won't need a high-school degree to take the class--the school's Computer Science Department has begun posting material from its second 10-week iPhone Application Programming course in iTunes U.
The last time this course was released in iTunes it was downloaded more than 4 million times, and there is no reason not to expect the same reaction this year. You will be given access to the same materials and notes that the students enrolled in the class get. But don't get too excited--iTunes subscribers don't collect college credits upon completion.
Stanford has posted two class sessions and their lecture slides as of press time: Introduction to Mac OS X and Cocoa Touch, Objective-C, and Tools and Objective-C and Foundation Framework. You can find them at iTunes U.