Internet access to college lectures is nothing new, but listening to them on portable gadgets is a more recent phenomenon of the digital age, spurred in part by the popularity of podcasts, or downloadable audio files.More details over here.
The University of Missouri offered podcasts of lectures through its school network before it signed up with Apple last summer as a pilot school. But "iTunes U" offered a software and service package for free, said Keith Politte, the development officer at the university's School of Journalism.
Apple iTunes U - offers college lectures

Apple and six universities have launched a new project called iTunes U, which enables students to download lectures and other educational materials via Apple's iTunes.