I found this fascinating quote today:

Spending your fiat money from the comfort of your iPhone is even easier, now that Amazon has released an application (“App”) for Apple’s little wonder. The mundane functions are as you’d expect: you launch the app, then you can browse and buy goods from Amazon just as you would from your computer.Nicholas Deleon, Amazon iPhone app: Take photos of items then buy them moments later, Dec 2008

You should read the whole article.