You've heard about the Registered Traveler Program right? - The one where they launched the pilot in 5 major airports to test the effectiveness of a quick way through security checkpoints for frequent flyers.
Well it was supposed to end by now but it's still going strong. It's getting good reviews, and seems to be beneficial to the airport and the flyers.
I know if I was a frequent flyer, I would have wanted to get in on that action too.