I don't like to walk around with fat pocket stuffed with lots of keys and a wallet overflowing with receipts, cards, and other crap. I like to have just my phone and a wallet that is as thins as I can make it. I don't even carry a key ring, my car key has the keyless remote built in so one key is all I carry. A new case for the iPhone 4 has surfaced called the Minimalist 4 that will even let me shed the wallet.
The Minimalist 4 case is designed to protect the iPhone 4 as you expect a case to do and is made from recycled plastic. The hard case will prevent damage if you drop the iPhone and will keep your skin from killing your signal by touching the antenna. The case is also made in the USA.
The controls and ports for the iPhone are left exposed for easy access and use. Measurements for the Minimalist 4 are 4.53" x 2.43" x 0.61" and the case weighs 0.51 pounds. You can have the case in any color you want, as long as that color is black. The coolest part of the case is the slot on the back of the case that can hold three ID cards or credit cards. You can pre-order now for $29.99.