Learn all about CHDK

the Cannon Hacker's Development Kit allows you to Hack the memory card of a Cannon camera to temporarily make changes to the way the camera behaves, without making any changes to the camera itself. This is great for kite aerial photography because you can set up your camera to take pictures repeatedly, as well as to do a number of other things that can be very useful for KAP. Here's a book that explains all about CHDK: