How is the Mclean’s website designed?

Hi, I love the Mclean’s website – it appears to run with post and catagories on multiple pages. How can I get that with my WordPress? I want to have it just like that, with multiple pages of blogs. I installed WordPressMU but it only gives me multiple seperate blogs, where in I want to have one blog with multiple blogs in it. Since Mclean’s uses WordPress too I was hoping I could use the same fearure, or at least get a better understanding of how they do what they do. Thank you so much!