Super site, Martin. Congratulations! This will be a great intro for users; your explanations are very clear, and if you weren't familiar with the program, you get to know it very fast. A definite must see for starting Terrageneers. And I'm sure the depth of tutorials will grow over time and give more experienced users some interesting knowledge.
One thing, if I may. It's set up like a blog, so the first tutorial is gradually sinking lower. You might reconsider the layout, as a first time user/viewer of your site will need to start at the first tutorial.
groetjes,
Ulco