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IEEE Spectrum magazine has a huge round up of thinking on the singularity.
Free Wi-Fi for AT&T users at Starbucks. Well, sort of mostly almost free. You have to sign up for a Starbucks card and have used it at least once in the last 30 days (just adding money to the card counts as "using" it.) And you have to make an account with AT&T where you agree for them to send you 4 emails a year, plus look at your Starbucks card puchasing data. In exchange you get 2 hours of Wi-Fi a day, limited to a single session (you can't leave and them come back, but I'm not sure if there is any safe guard against creating multiple Starbucks and AT&T accounts in order to get multiple sessions.)
This is a pretty good deal in my opinion, especially for an infrequent traveler like me (where having some sort of 3G modem for my laptop makes no economic sense.) Starbucks do have a great advantage of ubiquity.