Jed, that is excellent!  It's working very well for me too, and I've tried a little smoothness, and rounded/gausian edges - looking goooood!

Now... how did you create that height map?

Measure your mind's height
by the shade it casts.
Robert Browning (Paracelsus)

Fran's Freestuff

http://franontheedge.blogspot.com/

http://www.FranOnTheEdge.com