I carry around a lot of cards in my wallet. The drug store, the grocery store, my yoga studio, the library all have cards with barcodes which I carry. Luckily most of them are the ones that are supposed to fit on a keychain which means they are smaller and I can put them in my change pocket of my wallet. I like my keys uncluttered. Today I saw two brilliant solutions. One was the Just One Club Card. From 5 cards down to 1. Not back. But then I saw this solution. You scan all of your cards, front and back. When it comes time to scan the barcode, pull up the picture on your iPod Touch (or iPhone) and the teller should be able to scan. What could be better than getting rid of all of your cards and using a device you are already carrying? Pretty sweet.