That guy has his own forum which is quite active. It's mainly about creating your own languages and such, but there is a part of the community that is into created worlds and the occasional map or two is posted.
I found this site which has quite a sweet tutorial on it. Most of the information would be useful as entry level, but I think his hand drawn relief shading technique is really worth a look.
That guy has his own forum which is quite active. It's mainly about creating your own languages and such, but there is a part of the community that is into created worlds and the occasional map or two is posted.