We've mentioned CHDK before - the hacked firmware for many of Canon's point-n-shoot cameras. CHDK is awesome! It gives complete control over most of the camera's hardware features - so you can do time lapse photos, night shots with longer shutter speeds, lightning and motion detection, etc.
We've used it alot on our older SD1000, but have been waiting for it on our new SD780.
Its here! Some bugs still, but very cool. If you own a Canon, it is definitely something to check out.
If you don't own a Canon - go buy one. CHDK is the MAIN reason we only buy Canon cameras now.
They are good cameras, too.
Stay tuned - we'll share some new photos with CHDK features....