there is a MAC version
FAQ:
0) I have a 1D*/5D/10D/20D/30D/50D/300D/350D/400D/450D/1000D. Will the software work with it?
This works on any of the Canon DIGIC III/IV DSLRs except the 1D* series. This means it will work for the 40D, the 50D, the 450D, the 500D, and the 1000D. Thanks to all the 5DMkII users who reported success. As it turns out, you have to power-cycle the 5DMkII before the shutter count value updates itself. It will not work on the 1D*, 5D, 10D, 20D, 30D, 300D, 350D, and 400D. It's not that I have anything against the owners of those cameras, but simply that the Canon SDK does not support retrieving the shutter count for them.
1) The software reports that I've taken 1234 pictures, but the last image on my CF card is numbered 1111 (i.e., the number reported is higher than the last image number number on the CF card). Why?
If you've ever taken images while tethered to a PC with the EOS utility or other software, or with no CF card in your camera, those increment the shutter actuation counter, but not the numbering system for your card. If you've reset the image numbering on you camera or "rolled over" 9999 images, this may also occur.
2) Does using LiveView affect the shutter count reported?
Taking pictures while in LiveView increments the shutter count. Entering and exiting live view mode does not.
3) Is there a Mac version?
Yes. Note how lazy I am, I don't want to renumber my FAQs.
4) How does it work? Is it majick?
Yes.
4a) Seriously. Are you looking in the EXIF data?
No. It doesn't matter if there are any images on the camera or not, or even if there's a CF card inserted - the camera just needs to be connected.
5) I've heard that only Canon can extract this number, so you must be lying. Are you lying?
No, I'm not lying. I've heard the "Canon service center" mantra too - but there are thousands - well, hundreds - okay, at least *3* people I know of who believe this number to be a relatively accurate count of shutter actuations.