Tutorials for the iPad:
Guided Access: a new feature in iOS 6 that makes it easier for users with disabilities to use their iOS devices. The feature allows parents or teachers to lock children into an app, disabling the home button or limiting user controls on certain areas of the screen.
A guide for using iPad, iPod touch, and iTunes
for K–12 teaching and learning: A guide created and published by Apple to getting started integrating the iPad into the classroom
iPad Users Guide: Apples user guide/ manual for the iPad