If you are new to iTunes, read this primer. Or go straight to iTunes U and browse the 100,000 lectures, presentations, videos, readings, and podcasts it offers. Everything is broken into 13 categories, from Business to Teaching & Education. There are ESL podcasts, recordings of bird sounds, a series on Darwin’s relationship with God, videos on human body parts, and recordings of and interviews with Lead Belly, Pete Seeger, and Woodie Gutherie, above.
On the right of iTunes U are the 20 most popular downloads. Enjoy!