I've got a couple of thousand pictures in a zillion subfolders (by year/month/day) that were produced by some Mac iPhoto camera software or something. (I am on PC.) It is really a pain to try to work with these files when I can only see a few at a time. I'd like to put them all into one folder. Problem is, many of them have overlapping filenames (eg. IMG0001.JPG). Is there any type of utility, or even some sort of macro that would allow me to bulk alter the names on these files so I could put them all in the same folder together?