For those of you searching for the ultimate in skinny wallets, check this out: The Slimfold Wallet.
http://www.etsy.com/shop/slimfold
First off, it’s not tacticool 1000D Cordura, but since it’s made from Tyvek, it should still be pretty durable. American-made and eco-friendly. Personally, I hate having a fat, overstuffed wallet in my pocket and this looks like a good way to trim down. Unfortunately, my wallet is not fat due to having lots of cash, otherwise I wouldn’t mind! 
No, I don’t sell these or work for the company, but they seem pretty cool.