Make it do things Canon never intended to let you do...
http://lifehacker.com/387380/turn-your-point+and+shoot-into-a-super+cameraCanon cameras which can take the mods:
A450, A460, A530, A540, A550, A560, A570, A610, A620, A630, A640, A650 IS, A700, A710 IS, A720 IS
S2 IS, S3 IS, S5 IS, G7, SD450 (IXUS55), SD500 (IXUS700), SD630 (IXUS65), SD700 (IXUS800), SD750 (IXUS75),
SD800 (IXUS850), SD850 (IXUS950), SD870 (IXUS860), SD1000 (IXUS70), TX-1 (Note that some models will require software updates before loading the hacks.)
What does it enable?
Shooting in RAW
Live histogram
Battery indicator
Scripts execution (exposure/focus/bracketing, intervalometer and more)
USB-cable remote shutter-release
Motion-Detection triggered photography (fast enough to capture lightning strikes)
Customizable high-speed continuous (burst) Tv, Av, ISO, and Focus bracketing (unlimited shots)
1 Gig video-size limit removed in earlier cameras
Shutter, Aperture, and ISO Overrides (shutter speeds of 64" to 1/10,000" and higher)
High-speed Flash Sync at all speeds up to 1/64,000 second (even faster in some cameras)
Fully customizable CHDK display, info placement, user-colors, fonts in menus, etc.
Custom CHDK User-Menu (for instant recall of up to 10 favorite functions)
Sounds like fun to me! :)