Cool, the latest builds of CHDK have speeded up RAW+JPG file saving time now of
1.080 to 1.100 seconds on my camera. It has an option to display the file-write
time on each shot so you can see the speed you are getting. Continuous RAW at
1fps up to the size of the card. Nice.

They save RAW files directly to DNG format now too.

Interesting new page of a few sample photos at their download site that were
made using CHDK.

http://mighty-hoernsche.de/samples.html