One could really spend a lot of time looking through all of the things TumbleBooks has to offer. You can set up classes to view student readings, assign them books, etc. Tumblebooks also has a wide variety of formats for the students too. Take a look at the videos below to get a general idea of what it has to offer.

Adding a Class in Tumblebooks.mov
Adding Assignments in Tumblebooks.mov
TumbleTracker Overview.mov
Adding students to class in Tumblebooks.mov
TumbleBooks Audio.mov

Here is a guide to use as a reference if you forget how to set things up.