I purchased Noise Ninja several months ago, but never spent much time with it. I dusted it off tonight, and now I'm wondering why it doesn't have a fixed spot in my photography workflow.
I need to read up on the science and techniques of noise removal to understand better how to use Noise Ninja, but after 5 minutes of basically just using their automatic settings, I was able to clean up this ISO6400 shot from earlier this year.
Click the following to see the difference (open in new windows)
After Noise Ninja: