I second the call for a tutorial for terrain building.....
Especially a step-by-step read through, I personally find video tut's so hard to grasp.
If you do a read through, could you please keep it simple language wise-I have read another tut' regarding building terrain from DEM files but got lost with the technical jargon quite early on....
Thank you
And by the way, your terrain in the above pic's looks stunning-very nice work!