More to explore:
7-in-1 Credit Card Sized Tool Kit ... looks like compass, 2 magnifiers, pen, pencil, flashlight, some kind of red light, and maybe a sort of folding telescope? No details but more photos at Amazon. $3.87
credit card size light....
Iain Sinclair's Cardsharp 2. A Credit Card Sized Folding Knife kept in your wallet as a back-up tool.
Credit card size sewing kit
Credit Card Cutlery - Inke Hans: Polypropylene, credit card size
This Fresnel Lens Magnifier is credit card sized, so put it in your wallet and go. You never know when you'll need it. $1.95
Spare Key Holder Wallet Insert - Credit Card Size
Credit Card Sized Multi Tool
Credit Card Sized Jackknife.
Don't forget to take this out of your pocket before you go on a plane. Credit card sized toolkit