Some interesting series of blog posts on procedural content

I've mentioned some other procedural content blogs and web sites in previous posts, but I realized last night that I never mentioned the wonderful works of Shamus Young.  He has at least five series of blog posts that cover various procedural content projects.  There's source code available (C++ / OpenGL) for at least some of them, but the blog posts are more about process, technique, algorithms, and experiment results than about the code itself.

Maybe once I've gotten the world building tools a bit more refined I might try one of his approaches and try to visualize a world closer up than the previous planetary examples I've posted.  In any event, below are links to the first blog post in each of the five series I wished to draw attention to.

Terrain Engine
http://www.shamusyoung.com/twentysidedtale/?p=141

Hex
http://www.shamusyoung.com/twentysidedtale/?p=9644

Procedural City
http://www.shamusyoung.com/twentysidedtale/?p=2940

Frontier
http://www.shamusyoung.com/twentysidedtale/?p=11874

Frontier Rebooted
http://www.shamusyoung.com/twentysidedtale/?p=22825