FYI: Apple officially released iOS7, the latest operating system for the iPhone and iPad, on September 18. Almost simultaneously, Stanford began offering a course teaching students how to design apps in the new environment. Although the course is still in progress, the initial video lectures are now available online, you guessed it, on iTunesU.
This course, along with other top-flight coding courses, appears in the Computer Science section of our big collection of 775 Free Online Courses, where you'll also find courses on Philosophy, History, Physics and other topics.
Looking for tutorials on building apps in Android? Find them here.