Here are some DVDs and booked that you might find interesting:

DVDs:
Crate Games - Susan Garrett
Sucess with One Jump - Susan Garrett
Great Dog - Shame About the Handler - Greg Derrett
Great Dog - Great Handler - Greg Derrett
Foundation Jumping - Susan Salo

Books:
Click and Play Agility - Angelica Steinker
Agility Right From the Start - Eva Bertilsson and Emelie Johnson-Begh
Clicker Agility - Diana Bird

You can find lots more on the Positive Animal Solutions website and Clean Run