Southwest is offering 8 Rapid Rewards credits just for signing up as part of their promoting Washington-Dulles service.

Join Rapid Rewards and get 8 free credits. All you have to do is enroll by January 31, 2007. That puts you halfway to a free Award (16 credits). Plus, you’ll receive double credit each time you book on southwest.com and fly by January 31, 2007. That means you can fly 2 roundtrips into or out of Dulles and get 1 roundtrip free (it usually takes 8 roundtrips to get 1 free!) to anywhere we fly.