The vending machine shown here sells iPods, not music or audiobooks. 
Those you might get through WiFi, as others have noted.
The big question: Will the day come in the States when you can buy memory cards and maybe even e-book reading machines at airports? And how many books will the cards hold? I hope that publishers won’t be miserly. Otherwise people might as well just download the books.
If, er, memory serves, e-book cards are sold or will be at various outlets in Japan for e-book-readers such as the Sigma Book.
More at Flickr. (Via Boing Boing.)
