Nathan, I used your tutorial today... and I gotta say, this is wonderful! In fact, I wanna share how awesome this is....

I took this fractal terrain:
Click image for larger version. 

Name:	Starting work.jpg 
Views:	140 
Size:	983.0 KB 
ID:	65023


And ended up with this amazing outcome:
Click image for larger version. 

Name:	Imnotsure.png 
Views:	211 
Size:	2.06 MB 
ID:	65025


A great big thanks, Nathan!