Levelator

Would I use this to mix a show? No. But it looks like it could be a handy tool for doing some quick work on rought audio, and it's free. They bill themselves as a way for podcasters to even out audio levels that are all over the place. I hope I get a chance to play around with it soon. If I don't, keep it in mind if you have a lot of tricky audio that needs some work.
Link