Schwalbe Marathon Racer. About 3500 miles. It was the back tire on my commuter bike which usually has full panniers. it's been pretty darn flat resistant. I think the only flats I've had are when I've gotten a goatshead totally stuck in it. The front tire with the same mileage still looks fine.

My replacement is a Schwalbe Marathon GreenGuard Tire. Maybe I should have gone with the Marathon Supreme but it cost twice as much. We'll see how the GreenGuard works.