Fuji has been promising an OSX version for months now, but missed a succession of release dates. I can't dredge up the details now, but an individual has come up with their own beta version and announced it in the dpreview Fuji SLR Talk forum in the last few weeks. I didn't pursue it becuase I still believed Fuji at the time, but am reconsidering. Fuji also has made OSX noises about their studio management software package, but no joy there either. So far however, tiff performance with the S2 has been so good that we haven't felt too put out by the lack of OSX support for RAW. We haven't bothered to try tethered shooting in our studio, because in our experience clients become more interested in the monitor than in listening to us.
Hank