The Magic Lantern Multimedia Workshop for the Nikon D3100 is a comprehensive overview of the camera's function and features. Along with these two DVDs come a book and handy reference card that you can keep in your gear bag. The two DVDs will give you a thorough and in-depth examination of what the camera is and can do. The Wallet Card is small enough to take with you anywhere and the book can be used as a reference guide at home.
Quick Reference Wallet Card
Sterling Publishing Book/DVD: Magic Lantern Multimedia Workshop for the Nikon D3100 Digital SLR Camera