pros:
- fairly simple way to get to work with fewer time variables than car traffic or public transportation.
- efficient way to get some exercise
- see the neighborhoods and happenings around me more directly
- about the same speed as public transportation, but probably averages slightly faster. (Slightly slower than by car, but that wouldn't really be an option for me anyway; our whole family has one car and isn't going to get another one just for me to drive to work.)

cons:
- exposed to all weather (no air conditioning, for instance). Have to worry about weather more to make appropriate plans. Complicates things.
- more dangerous than other forms of getting to work; higher chance per mile of obtaining an injury
- can make me pretty sweaty
- can make me tired right after the ride
- even though I have a pretty simple bike setup and don't have special cycle clothes, it is honestly more expensive altogether than just using public transportation/walking, or the gas/car costs for the commute trips.
- the awkwardness right after people ask me if I wear a helmet
- I don't take a shower at work, so after I ride home in the evening I often feel like I need a shower if I'm going to go out with people.