- The software provided for video transfer doesn't have a Mac version.
The informal advice of the - helpful - person who answered at Canon was to try out iMovie 08.
I did try and it seems to work mostly fine. I am seeing some posterizations in very dark areas, but it is difficult to say whether it is a Codec problem, camera issue or some limitations of iMovie 08.
Either way, the detail and sharpness appear to be pretty good when viewed full screen on my iMac 24 inch. I need to test this baby a lot more obviously.