I read a review recently that stated pretty clearly there wasn't any sort of manual. Luminous Landscapes recommends just using SPP to sort through and find potential keepers, adjust white balance if needed, then export the files you want to use as 16 bit TIF files. Then open them in Lightroom (or the editor of your choice) and go from there. I played with a few Sigma raw sample files and it seemed to work great. Amazing IQ, I have to say. High ISO wasn't as bad as I thought either, for B&W at least. All sorts of weird stuff happening in color, but not all that noisy and the B&W 3200 files looked pretty decent. If I ever get to try a foveon camera, I think that's what I'll have to do.
-Ray