Regarding Lion not supporting EOS Utility; I hope this helps. I upgraded the utility that was version 2.6, this was already working on Lion, I just figured I'd update it. Big mistake as I could no longer access the software from Lion! I reverted to the CD I got with the camera, loaded the software and I'm back in business on Lion. This version allows me to shoot with my 5D Mk2 and my 1DS Mk3. I have no idea if it supports other cameras... Good Luck! Matt