“Robot Camera”
While not for the beginner, you can add a free open source piece of software called CHDK to the SD Flash card on this camera and add a whole new realm of features normally only found on very expensive DSLR cameras used for scientific inquiry.
http://chdk.wikia.com/wiki/CHDK
I've been using it to take time lapse (intervelometry) photos of rare plant species to study their growth, pollinators, and grazers (who eats them). You can also to motion sensing and tailor the sensitivity so that motion only in certain areas of the screen will trigger it.
While this "how to video" on you tube is a bit condescending, it's a very good step by step on how to setup CHDK on most of the point and shoot Canon Cameras.
http://www.youtube.com/watch?v=bXlL3iPuNKQ