Interesting post at Ars about having an iPhone in an airport. My recent flight to St. Louis agrees with this analysis; you can find chargers and other accesories everywhere.
This probably has more to do with iPod ubiquity than the iPhone. But the consumer perception is still there nonetheless.
You don’t notice just how many shops and electronics vending machines have iPhone accessories—chargers, battery extenders, external speakers, etc.—until you’ve rejoined the ranks of the iPhone-less.