Apple has added the ability to purchase iTunes credit in-store and show your total balance using iTunes Pass and the Passbook app.
This is great for those frequent purchases but more importantly, opens the door for Apple to offer online purchasing with your iTunes credit.
it seems everyone wants a piece of the mobile-wallet pie. Amazon launched their paypal like service last year and now Apple has done the same.
In some places you can now checkout with either a traditional Credit Card, Google, Paypal, Amazon and soon iTunes. Who will be next to offer their take on online wallets?