Click Here to read about CHDK and find out if code has been developed for your camera model and firmware version.
BEWARE! this video is rated "G" for Geek and may contain scenes that are too nerdy for the average picture taker. I hope this video helps you, as there are not many well produced video tutorials on CHDK out there yet.
I'd love your feedback. Let me know if you encounter any problems as you follow along and I will respond to your comments and messages. You might want to try heading over to the CHDK Community on G+ to see what others are doing with the software and ask questions there too. Good luck!