Quick Mapping with Photoshop
I often use actions to do this and that much faster. So I experimented a while around and this is the result. An action which automatically creates the continent, mountains and a bit of finetuning. If you want to use it, go to window -> actions -> load action and choose 'Quick Mapping' from the list, after you downloaded and unzipped it. Nothing more to do than clicking on each step, it creates automatically a new document.
I don't know if it works with older versions than CS4 or other language packages than english (as it seems to be guided by the layer names). If not, I'm sorry. :( If it does work, have fun. :)
But for now I hope I get it even uploaded.
Oh, I forgot: if it says something about 'no pixels selected' in step 2, just click okay. That randomly appears, when the mountains get a bit too small.