If you have a Canon PowerShot, this is worth checking out – The Canon Hack Development Kit @ CHDK Wiki…
CHDK – Unleash the POWER in your Canon PowerShot!
What is CHDK?
Canon Hack Development Kit;
Temporary – No permanent changes are made to the camera.
Experimental – No warranty. Read about the risks in the FAQ
Free – free to use and modify, released under the GPL.
Professional control – RAW files, bracketing, full manual control over exposure, Zebra-Mode, Live histogram, Grids, etc.
Motion detection – Trigger exposure in response to motion, fast enough to catch lightning.
USB remote – Simple DIY remote allows you to control your camera remotely.
Scripting – Control CHDK and camera features using ubasic and Lua scripts. Enables time lapse, motion detection, advanced bracketing, and much more.
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Agree! CHDK is awesome. They have a flickr pool @ http://www.flickr.com/groups/chdk/ showing some of the types of photos you can take. Pretty cool stuff. You probably want to check out your model number @ http://mighty-hoernsche.de/ to see if your camera is supported by a non-beta version of the software, as some of the betas are a bit buggy. If you do run into a bug, the firmware is not permanent – you have to load it each time, which, using a camera trick, you can arbitrarily turn on – so at worse, if you’re away from your computer, you can use the “regular” firmware on your CPU, and then re-flash when you get back home. Note that this firmware is *only* for the point & shoot variety, not the dSLR cameras that Cannon sells.