http://chdk.wikia.com/wiki/CHDK_in_Brief I came across this by accident. Those of you that do not have RAW capability and wished you do -here is an option. Other features as well. Pavel
Good find, Pavel. Basically you put a firmware file onto your memory card and load it up, and it adds extra features. Great if you have a low end camera...
It's also non-destructive - you can easily revert back if you don't like it.