Is your wallet exploding from multiple rewards cards you have to carry with you? Slim it down with this useful online tool. Just enter barcode numbers from up to 8 cards and the tool will convert them to a two sided printable one card format. Laminate the resulting super-card and enjoy the convenience!
The list currently has 110 merchants and many of my favorite stores are missing. See if you have better luck with it and tell us in the comments.
One thing worth mentioning is that some stores accept phone number as identification which eliminates the necessity for carrying a card, others will accept the drivers license. It would be great if merchants organized and created a single identification system that works everywhere, similar to OpenID in the online world.
Source: Organize Your Wallet at TheFinanceJorney