For all you art lovers out there - MOMA - The Modern Museum of Art in New York offers Audio through their website available for download as well as an entire "store" on Itunes.
All of their lectures, special exhibit audio, etc are free - which is fan-tastic!
Also, while we are on the subject Itunes - Itunes has something called ITunesU which boasts a huge library of free downloads in a variety of subjects including languages, art history, literature, and humanities. It is a wonderful thing to download and have on hand for a long road trip or a wait in the doctors office.
This is the link to the MOMA Multimedia Site: