This year the majority of my courses are on iTunes U. I really like the program but it is a bunch of work. My teammate and I share the responsibility and both plan different subject areas. I do reading and social studies.
If you are interested in seeing what we are doing you can check out my courses. You will need itunes U in order to open it. It will open on an iPad, iPod, or iPhone (if you have the iphone 5 I am jealous!)
If you have any questions about using this at your school or would like more info let me know!