ITunes

"Tunes U is a free hosted content distribution system from Apple that enables colleges and universities to make audio and video material from lectures, interviews, audio books and other sources available to students with the ease of the iTunes Store. It allows users to download the content to their Mac or PC, transfer the information to a portable device and view or listen to it anywhere and at any time. Apple offers an introductory video for more information."
"Texas A&M on iTunes U is a university-wide educational site that provides educational, marketing, and service content using a multi-media experience (video, audio, and PDF) that appeals to the user's mobile lifestyle (MP3 Player, iPod/iPod Touch, iPhone)."