Is there a valid Android alternative to iTunes U? iTunes U makes the difference (at least, to me) when it comes to choosing a tablet for study purposes. Does it exist a valid Android alternative to Apple's iTunes U?

For those who don't know iTunes U, it is a service that allows students and teachers to manage, browse and view media (such as videos and pdf files) related to education.
Tunesviewer is an application for Linux or Android that "[allows]  access iTunes-University media and podcasts." (From Tunesviewer main page).

You may want to check it out. There is an APK installer to run on Android devices. It's also available from F-Droid.