Traditionally, the only way to redeem iTunes Gift Card codes was by typing the unique 16-character code into your computer or iDevice. In iTunes 11, Apple has added the ability to snap a photo of the code using your computer’s camera. Once users have done that, iTunes will verify the code and automatically transfer the funds to the user’s iTunes account.
This new feature of iTunes 11 remains limited to Windows and Macs, but we presume Apple will soon add the functionality to iPhone, iPad and iPod touch.
Product [iTunes 11]