There is now a site dedicated to napkin folding, seems like it was only a matter of time. While it might sound kind of lame, it's not. They currently give detailed steps on how to make 27 different kinds of napkin folds. Some of them are pretty fun to look at, and if you are having a dinner party, they are sure to generate conversation. I could imagine that it'd be fun at your next party to use a different fold for each place setting.

Me, I like the "bird of paradise" napkin fold...