I've been using gimp for a few years. It's nice for a free program, but I find it difficult to use. I can't find a way to use it to organize lots of photos - like the way the lightroom does. But there's a good
thread about gimp around here somewhere.
I'm more interested in learning about the Canon program as it does both workflow and editing.
Photo management is something I'm keen to learn before getting an interchangeable lens camera. RAW photos are supposed to be big files, so I want to make sure I have good photo hygiene before I start working with these.