Until recently, when you wanted to check if the lots at DFW were full, the airport website had only a link to an mp3 audio recording of an hours-old telephone report.
Today I found this page (new, I think).
http://www.dfwairport.com/parking/av...lity/index.php
It shows availability for each lot, even breaks apart the terminal parking into the separate garages for each set of gates, and shows prices and the time of the update, all at a glance on a single page.
Kudos, DFW!