Quote - Wow, that's great Dave. What are your Neat settings for that? It really makes a HUGE difference!

 

I didn't save the settings, but I just clipped out the high frequency noises using the "Y" channel and adjusting it to taste.  The base image you created was already pretty clean to begin with.  By the way, I agree with Mark that your image is much more realistic than the the Terragen render.