Evan Doll and Alan Cannistraro are running a course on iPhone application development at Stanford University, such has been the demand for the course that they have made it available via iTunes U.
iPhone Application Programming
The 10 week course is published every Wednesday and Friday and each lecture lasts about 1 hour and is accompanied by notes in pdf format. This is a hugely popular course and is now top of the iTunes U downloads.
There are full details of the course online.