Here's a little something for the guys who own Canon Digital Camera.  It's the Canon Hacker's Development Kit, a firmware enhancement that allows you to make the most of your camera's hardware specifications.

Put another way, this means that you can you can unlock several functions that were not available in the camera's stock build. Here's a sample of some of CHDK's added functions:

• Save images in RAW format
• Ability to run "Scripts" to automate the camera
• Live histogram (RGB, blended, luminance and for each RGB channel)
• Zebra mode (blinking highlights and shadows to show over/under exposed areas)
• An "always on" full range Battery indicator
• Ability to turn off automatic dark-frame subtraction
• a higher compression movie mode, and double the maximum video file size
• exposure times as long as 65 seconds
• exposure times as little as 1/10,000 of a second
• ability to use the USB port for a remote trigger input
  

To run CHDK, you will first need to check if there's one available for your specific Canon digital camera model. Those interested in in using the CHDK software, or want to check if their camera's compatible, will want to visit its official site via the source link below.