http://ping.fm/UAmOi
Apple iTune U is considered the world most renowned educational directory on the internet. The iTune U is Knowledge, apart from music and video distribution, around 800 universities from around the world to share content with Apple iTune U. You will find materials in iTune U from universities like Harvard, MIT, Cambridge, Oxford, University of Melbourne, University of Montréal etc which explains the magic number of 300 million downloads