Storytelling and Worldbuilding articles

I just found these 3 articles from Gamasutra, on WorldBuilding and Story telling. Gamasutra is an online magazine on computer game design, unfortunatly you have to regester to reed the articlas, but thankfuly, the author, concept artist Don Carson (check out his artwork), posted the first two on his blog:

-Environmental Storytelling: Creating Immersive 3D Worlds Using Lessons Learned from the Theme Park Industry

-Environmental Storytelling, Part II: Bringing Theme Park Environment Design Techniques to the Virtual World

There is a third article here on the Gamasutra site.