http://www.planetside.co.uk/wiki/index.php/Terragen_2_Tutorials#Parting_Sea_Tutorial
I just made a first set-up for my tutorial in the Planetside Wiki.
It's very basic, no pictures or anything. I'm still learning the wiki system, so it might take a while before it looks good.
But if you want to try your hand at it already, use the above link.
Thanks Mohawk. Nice of you. I'll check it out.