The Multitouch Interaction course at Media Lab Helsinki (Aalto University, ARTS) focuses on using multitouch to create engaging experiences. Multiple devices are used, with an emphasis on the iOS platform. This video is a compilation of the exercises and projects done during the course.
iOS apps source code available at
More info on the course, and projects: http://mlab.taik.fi/mediacode/c/courses-projects/mti2012