Of all websites, that I've been to, I think Macrumors.com has some of the most specifically targeted audience. True to its name, the website post rumors and tipoffs about upcoming mac products. Because of the kind of community targetted, the website uses a blog format where a story is posted by one of the administrators and the fans can post comments on it. Unlike traditional news sites, every story is interactive.
The content is both the rumor and comments the around it. The advertisements are also targeting an audience deeply and religiously mac-oriented.