It's not all about style, after all. There are practical considerations as well. For instance the sans-serif fonts are considered more readable and are generally used for the body of an article.
Mull over, too, the fact that while the selection of typography is impressive, there's no need to stick to your tried and true. In this veritable smorgasbord of style it's always fun to sample the unfamiliar too. But don't overdo. Too much is like a room full of different personalities — fun at first, but generally doesn't really work. For more facts, and fun, on fonts try these informative sites:
Ben Hunt's Web Design From Scratch
A Practical Guide to Topography on the Web
Choosing the Right Font for Your Project
Why the Web Hates Comic Sans
If Fonts Had Voices