There's a learning curve to CO2 so make sure you have two cartridges the first time you need to use it in anger.
It is nice to have the tire inflated in about one second rather than a couple of minutes of stroking a minipump.
Spare tube and patches! Patch the tube when you get to work and then you'll have a spare for the way home. (that's where the minipump comes in handy!)
My commute is over for a while. I have no issue with going to work in the dark, but going home in the dark approaches suicide.
Next week when the time changes it will be particularly bad. Drivers seem to go nuts for a couple of weeks till they get used to it. The other bad time is Thanksgiving to New Years. Everyone is in a hurry and distracted it seems.