Pros:
Fresh air and sun (or fog - this is the Central Coast )
Fitness - Just enough to wake up and get the blood pumping
Fuel savings (not that significant with such a short commute - 4mi each way)
Food savings - helps force me to carry lunch in instead of going out
Extra time to decompress on way home - let work be work/home be home

Cons:
Coastal Headwinds
Changing clothes (riding in uniform is WAY too hot)
Coastal Headwinds
Harder to run errands at lunch/on way home
Coastal Headwinds
Extra time in the morning - after PT on M/F don't have time to ride and make it to morning meeting
Have I mentioned coastal headwinds?