My humane organization needs a free and easy to use photo editor. It needs to be able to the basic photo corrections: exposure, red-eye. It also needs to be able to crop (to a user-defined aspect ration and/or size).
I can't emphasize enough that it needs to be easy. My group has a bunch of people who can browse the web and email but editing photos is a challenge for some of them.
Of course, we have no money to spend on an editor. It needs to be windows compatible.