How long is your line?

I just heard from a friend about a nifty new Web site launched by TSA where you can look up your airport and departure time to get estimated wait times. Even though it has a disclaimer--“Please note that your personal experience may differ due to weather, airport flight schedules, staffing conditions, holidays or special events”--it still should give you a clue about whether it'll be a breeze to get through security, or a line long enough to get people mooing (why do people do that when they're in a long line?)