"Why attend OLLI classes when you can just use iTunes to listen to lectures by Nobel Prize laureates?" is Art Gorski's pronouncement.
Today's (August 24) news article from Cupertino announces, " In just over three years, iTunes® U downloads have topped 300 million and it has become one of the world’s most popular online educational catalogs. Over 800 universities throughout the world have active iTunes U sites, and nearly half of these institutions distribute their content publicly on the iTunes Store®. New content has just been added from universities in China, Hong Kong, Japan, Mexico and Singapore, and iTunes users now have access to over 350,000 audio and video files from educational institutions around the globe."
Read more here, and note that it is FREE download of iTunes 9 for Mac + PC. You can even access iTunes U on your iPhone or iPod Touch.