Just reviewing my commuting stats for the year, and I thought others might have collected similar data. With potentially 5 working days to go (Monday and Tuesday will be holiday days and I might not go in all three other days next week), my stats at the moment look like this:

biked 144 days, (104 on tour bike, 40 on mountain bike) 1500 miles

bus/subway 47 days, usually due to wintry conditions. I bike in cold or rain, but not on ice or snow.

drove car 8 days, usually due to offsite meetings, needing to take the car in for service downtown, or theatre tickets after work downtown with wife, who prefers driving

cabs 2 days - actually 4 "half days", where I took the bus in the morning, and worked very late, taking a cab home in the evening

There were also about 25 days where I worked out of town that I don't keep a record of. Sometimes I rent a car, sometimes I use cabs, but mostly I stay at a hotel close enough to the worksite that I can walk.

I'll update this data with final stats at the end of the month