I`ve heard a lot lately about credit card knives. I gather MadDog used to make them and Bladerigger is advertising them in this months TK. I was curious enough to whip up a few different prototypes of my own and I have to admit they`re pretty neat. For those that have them,what do you use em for? Any ideas about how to improve on existing designs? My latest has two staggered finger holes that allow a nice 2 fingered saber or hammer grip with a curved edge all the way across the short side and half way down the long side. What type of steel should I make en out of? Stainless or coated tool steel? Thanks for the input. Marcus