Right now, iTunes U on the iPad isn't a complete educational tool. You can read textbooks, but not much else -- you still need to use old-fashioned email to ask the teacher a question, for example. It's going to be much more useful on July 8th, when Apple releases a major overhaul to the app. The new iTunes U lets teachers create and manage courses entirely from the iPad, plucking source material from other apps and even the device's camera. Students, meanwhile, get some much-needed interaction -- you can now ask questions from the app, or join in class discussions.