I also have the same problem. I also have a Canon A570IS
with 1.01A firmware and have tried both the Fingalo and Allbest CHDK builds with default raw settings. The .crw raw files seem to be invalid
. (I have Photoshop CS3 with latest RAW updates, Lightroom, and Zoombrowser) None of them read the A570IS .crw from CHDK firmware (says invalid file type)...I think these files are not valid (corrupt) and don't work on the A570IS with CHDK firmware. Also tried DNG4PS-2 converter and it said the raw file is invalid.
Perhaps it's because A570IS uses the newer Digic III chip so it doesn't work with CHDK and other cameras with working raw files are digic II based?
This person also has a A570IS and also can't read .raw files. RAW files - All .CRW files are 9MB???
UPDATED: Success. Just tried Photoline & Picasa and they can open the CRW files! Kinda odd how the those other ones can't read it.