Anthony,
I'm on the other side of the continent. Machetes or pangas are generally not carried in town (actually Dar is a major city) but in the countryside they're everywhere. Security company rent-a-cops carry batons, either wooden truncheons or pr-24. But the most striking thing is that the Maasai warriors, who very often work as guards and night watchmen, wearing their traditional red robes, walk around fully armed, with their hardwood clubs tucked in their belts, a stick or cane in hand (often with a knife inside, like a sword cane) and, sometimes, with a short spear under their robes.
Guns are rare (and too expensive for local hoodlums) but some are coming over the border from Congo. Shootings happen occasionally. Foreign missions are heavily guarded (since US Embassy bombing and 9/11), especially Umoja House (which houses European Commission, UK, German and Dutch missions) and US Embassy (looks like a fortress,

). Local notables have guards patrolling with shotguns.
Machetes are a weapon of choice for muggers, so after dark anyone flashing a large blade can expect to be shot dead or run over by a 4WD, just in case.
Naturally, in this environment, a Leatherman is a valuable and envied possession, and not considered as an intimidating weapon. I never go anywhere without it.
Any other expats in the Forums, US or European?