From this Zemanta-suggested article, I found out that there is a free, open source project called CHDK that can turn your point-and-shoot Canon camera into a super camera. From what I can tell, you copy some files to your camera's SD card, and CHDK expands the capabilities of your camera way beyond what it can do now. You can get features like RAW shooting mode, live RGB histograms, motion-detection, time-lapse, and even games on your existing camera. It's non-permanent, so you can try it out and easily remove it whenever you want.
I don't really have time to play with it now, but I wanted to save the article and the links so I can read more about it and try it later. Do let me know if you've tried this or if you think this is helpful.
Zemanta suggested some additional articles that may be helpful: