Jamie from Florida carries a Kahr CM9 on the daily. With its 3-inch barrel and overall height of 4 inches, the CM9 is easily concealable and pretty lightweight, too. He also says he has both a Leatherman and a Kershaw Blur. It looks like all his tools are relatively compact.
How do you carry in a non-permissive environment? 9mm or .380 ACP?