What's up with the barcode here: http://www.idiojet.net/wp-content/uploads/2011/10/Scan-Barcode-Pics.jpg I keep seeing them everywhere and I don't know what that is. My friend told me this was something to scan with an iphone to get prices and stuff. How do I implement this kind of thing? Is it very complicated? Anybody got a story to share (success/failure/mixed)?