I'm a very frequent flier on Southwest Airlines. About 10 flights a month on average when I'm in the USA. You can imagine just how happy people like me will be with WiFi on the flights.
Having used WiFi during the Boeing Connexion era last year on international flights the feeling of getting off a plane and being all caught up on email, and blogging, is rather relaxing. Personally, I'd love to beta test this once SouthWest gets it up in the air.