There is nothing more frustrating to me when travelling than to power up my laptop at a major American airport (I'm looking at you, JFK) and finding that WiFi is only served by Bongo or some pay service that costs $10 a day.
Ridiculous!
So now that Skype has stepped up to the plate and agreed to offer free WiFi at some major airports for an hour ($6 per hour after that), I have to tip my hat. It's rare that I need WiFi at all, but when I do, it's usually for a lot less than an hour (check on plane delays, rebook a cancelled flight, that sort of thing).