David Wong's put together an entertaining (laugh-out-loud funny, actually) little piece that explains US vs. THEM mentality and why, exactly, we consider people we don't know to be, well, less than people... you know?
Beyond the Monkeysphere
Any thought-provoking piece that starts off with asking me to picture a monkey dressed like a little pirate can't be bad, I know. But this one's especially good :)