I managed to get access to Mac OS X (intel) for a short while and it seems like I got the program to work. Some minor changes in the GUI had to be made for the Mac but the functionality is the same as on the Windows version.
Note that the mac version requires that exiftool is installed (the windows version bundles it) and that the Mac version really is a Windows app in disguise and therefore doesn't really behave or look as typical mac application.
Please have a go: http://nilemada.com /?page_id=166 and please let me know if there are some issues. I had very short time to test it on the mac...