They love nothing better than sipping free-trade gourmet coffee, leafing through the Sunday New York Times, and listening to David Sedaris on NPR (ideally all at the same time). Apple products, indie music, food co-ops, and vintage T-shirts make them weak in the knees.

They believe they're unique, yet somehow they're all exactly the same, talking about how they "get" Sarah Silverman's "subversive" comedy and Wes Anderson's "droll" films. They're also down with diversity and up on all the best microbrews, breakfast spots, foreign cinema, and authentic sushi. They're organic, ironic,...