On my person, usually just my Leatherman Wave. I used to carry a folding K-Bar when I did radio work, but don't have much need for it here at the office now. In the car, I keep a Cold Steel SRK. I have another one in my BOB, and in the drawer by my pillow I keep the Swamprat Desert Battle rat.
Back in Baghdad, I wore the Leatherman and one of the SRKs on my hip, and the other SRK on my ankle most of the time.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)