Wouldn't it be cool if your wallet could protect itself? The TungstenW wallet from Aegis Innovations is probably better at self-defense than you are (GearLog). It is made out of either carbon fiber/kevlar, pure carbon fiber, or fiberglass. Hook the wallet up to your computer, program your fingerprints for the wallet's biometric scanner, and you're good to go.
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Being tough as hell and hard to open are only part of the story. This wallet can connect to your cell phone via Bluetooth. When separated by more than 10 feet, an internal alarm will sound and warn you. You can get it in fiberglass for $399, carbon fiber/kevlar for $599, or just carbon fiber for the same price.