I try to ride at least half my trips to school and work in any given week. They are in opposite directions from my house, which is nice if I'm going from school to work or vice versa because I can stop at my house and not go out of my way.
The down side is, both routes literally stink. On the way to work I have to go right past the garbage dump. On the way to school, it's the water treatment plant.
Thought it would be interesting to see if anyone else has a stinky commute.