Interesting: Amazon is offering same-day delivery for certain items—and for an additional fee (Amazon Prime members would pay $6; non-Prime members would pay $15)—in NYC and six other cities. The Bits blog reminds us of the olden days of Kozmo.com and Urbanfetch: "Of course, those earlier players did not have sustainable business models: Urbanfetch and Kozmo were saddled with huge delivery costs (paying a fleet of bike messengers) that they tried to offset with higher-margin products (DVD players and video-game consoles), but it didn’t work—most people just ordered a pint of Cherry Garcia and a pack of Marlboros."