I saw this news story recently:
http://www.mercurynews.com/breaking-...nclick_check=1
Quote:
Downloads from Apple's 3-year-old iTunes U have exceeded 300 million, the Cupertino maker of Mac computers and mobile devices announced Tuesday.
In a news release, Apple said iTunes U now includes 350,000 audio and video files from more than 800 colleges and universities, including elite institutions such as Harvard University and the Massachusetts Institute of Technology.
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But to tell the truth, I have no way of knowing what those numbers mean

It sounds like a lot of downloads, but I don't have any comparison point for it.
Glad you found a great use for all that information out there though!