Now this has to be one of the coolest hacks for a smaller Canon digital camera that I have seen. It has spy appeal plus you earn instant geek points with just about anyone who will see this in action should you choose to build it.
Yes, anyone can strap one of the newer digicams to a remote-controlled (RC) plane and send that plane to the sky (with automatic image capture enabled, of course), but I doubt any pictures would come out decent if good PC plane-mounted images were your goal.
Why not make a simple gyroscopically-stabilized system for that camera before you mount it to your hobby plane? There are already gyro assemblies made for RC planes, but retrofitting one to hold a digital camera will take some elbow grease, plus a smidgen of cash.
But, if your goal remains to take crystal-clear aerial photos of anything you'd like (where RC planes are allowed, of course), try this project on for size. Video follows below.