In its ongoing quest to take over all aspects of my modern life, Google has announced that it will thoughtfully be providing free wi-fi at 45 airports through January 15, 2010. You can see a list of participating airports here; Seattle users, rejoice in the knowledge that SeaTac's free wi-fi will continue indefinitely!
There's also a contest, in which you can win prizes by submitting a photo of yourself using the free wi-fi in any participating airport or on a Virgin America flight, starting November 16, 2009. I guess you could use your iPhone to take a picture... of yourself... using your iPhone? Well, whatever, I'm sure it will all work out somehow.