At the intersection of Nerd Ave. and Geek St.
This is a very clever Flickr set of fake Magic: The Gathering cards, featuring presidents, ancient Romans, and (my favorite, of course) philosophers.

In addition to Nietzsche, there's Machiavelli, Hobbes, Kant, Kierkegaard, Marx, Mill, Heidegger, Carnap, Popper, Wittgenstein, and Quine.
(Via Julian Sanchez.)