They just announced that you can save $25 off of the cost of a membership if you pay with your MasterCard.

https://enroll.clearme.com/r/RF6YTI6A

I use this program every time I fly out of Orlando and it is a tremendous time saver. I used to have to get to the airport by 5:30am for my 7am Monday morning flights but I now get to sleep almost an extra hour because I am at my gate within 5 minutes of entering the airport.

From what I understand many other airports are coming on line in the first quarter of 2011. In my opinion it is well worth the cost.