The BCB Mini Work Tool looks like a miniature version of the ATAX tool that Toolmonger featured a few weeks ago. This credit card-sized piece of stainless steel integrates 11 tools in its simple frame, including a knife, saw, bottle opener, flat screwdriver, and a hole that can be used as a wrench.
It comes with a case, so you can easily add it to your arsenal of everyday carry items. Only a few vendors sell this particular brand, for about $10. If you want to go down-market, you can choose from a lot of knock-off versions with street pricing around $4.