CHDK
Some enterprising users have taken matters into their own hands and developed their own software for running Canon digital cameras. CHDK or (Canon Hacker's Development Kit) allows you to install a tiny program on your memory card (which means it's not destructive and can be easily removed) and bypass the default camera settings for a custom set that offer a far greater range of options. Allowing any camera to shoot RAW images is the big plus, but you can also specify custom exposure settings, ISO settings, motion detected trigger photography and even games.
Check out the FAQ for more info or Lifehacker for a low-down on how to get it up and running.
26th Jun 2008 - Tumblr