How To Install CHDK on a Canon PowerShot Camera - YouTube Video

Installing CHDK on a Canon PowerShot Camera - Canon Hack Development Kit

CHDK Main Features

• 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. Visit the CHDK Wiki for more. 

Additional CHDK Resources:

• chdk.wikia.com
• howto.wired.com
• komku.org
• lifehacker.com
• reviews.cnet.com 

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Magic Lantern Software Enhancement  for Canon EOS Cameras
Magic Lantern SD /CF software

Canon PowerShot SX40 HS Camera