That'll teach you to get a mac. (JK)
Seriously, I concur with the others. No matter what you're using, mac or PC, whatever program you're using should automatically recognize the camera and the download should be step by step from there. If adobe does make photoshop for the mac then I'd definetly get it. I just got photoshop CS2 and I so want to learn it. Just dont have the time to spend with it right now. And if the price turns you off, then (keep this quiet now)
download it.