At Boston's Logan airport, there's the logan wifi network which allows minimal web-based content on the free side of the pay-to-web-surf wall.
An unintended benefit to the crippled access: using my standalone copy of Shrook (my RSS reader), most of the pictures associated with feeds download at least partially. I didn't scientifically measure anything, but it looks to be about a 12Kb limit before the wifi pay-me sphincter squeezes shut. Definitely not enough of a glimpse to see whole photos, but surprisingly enough to get logos, illustrations, etc accompanying the blog posts.
Of course, no email or web pages are allowed thru, but for some reason Shrook can rain down supplemental content for the feeds already sitting on my macbook pro. No new feeds without paying.
When I'm traveling, it's usually the feeds I'm catching up on anyway. w00t!
Oh and I see that Continental airlines is trying to offer free wifi access at Logan in their Frequent Flyer lounge. I'm sure we can look forward to seeing a lot of "your free wifi is interfering with critical airport communications" (while the pay-to-surf wifi has no such effect?!) Follow along on Google.