I recently purchased LightZone for the Mac and have just been playing around with it a little. I'm quite startled by the results it can produce.
Here's the result of a couple of minutes playing with an image.
This first shot was as it came out of the camera
And here's the LightZoned shot
The original image was a JPG, not a RAW. It still needs some work, but it has transformed a "throw away" shot into something I can work with.