Without a car of one's own, there are three vehicular options for getting around Dar es Salaam - Taxi, Bajaj, and Dalla Dalla.
I want to give you a flavor of each.
Bajaj (my favorite)
Dalla Dalla Posta station in the city center
The ride by taxi from my hotel into the city center takes about 15 minutes with no traffic. The cost? Taxi: $6.60, Bajaj: $3.30, Dalla Dalla: 16 cents
Frugality is a hallmark of Powering Potential so now that I've learned the system, I take the Dalla Dalla unless I'm dressed up for a business meeting, under time constraints, or running out of patience :)