Here’s a link to a useful article from Joel Johnson at Popular Mechanics that rounds up useful tips on how to snag free wireless Internet access at airports.
Johnson also offer a bonus tip: how to find a working airport power outlet when one of those newfangled advertiser-sponsored charging stations aren’t nearby:
“…[S]imply seek out a stand-alone water fountain or a vending machine (assuming its outlet isn’t hidden behind). If they are turned on, they are plugged into a working outlet. Plugs come in pairs, and if one is working, its partner almost certainly is as well.”