I'm a huge fan of the Leatherman Micra, as it's trivial to have it with basically all the time. I've been surprised with how efficient the screwdrivers manage to be, and at least for me, it covers everything I'd plausibly run in to while out and about (I have a separate one for doing electronics, that includes wire strippers and such, but I've never run in to a situation where I needed that one unexpectedly :))

The tweezers are a bit awkward, but I've used them to remove a number of splinters, so they definitely can do the job (I go barefoot, and having this thing around is wonderful for that alone...)