I've done a bit more on that terragen mountain scene and have installed the new erosion shader. I think I need to limit the erosion a bit!
And from a slightly different viewpoint having sorted out some more things:
From the same file having moved the camera and added a few more things, maybe I need to calm down those stones in the foreground a bit?
(I had to recover this post there appears to be some sort of blogger bug where changing tabs while editing ends up with a different post in the edit window and if you save it it overwrites the original!)