thdave - Donna is fine.
Being that I work in a shop that caters specifically to those who commute I can tell you that the bikes people use are as different as the people who ride them.
These are the bikes I use for commuting...

'99 Trek 7500 - 16 speed

'87 Kuwahara Cascade 3 speed conversion

'87 Kuwahara Cascade fixed gear conversion

1962 Peugeot fixed gear conversion
The Kuwaharas get used for foul weather commuting and the 3 speed is my primary winter bike.
The Trek is fast on the road and allows me to take the MUTS and trails as do the converted mtb's.
The Peugeot logs the most mileage of any of my bikes as she is my spring - fall commuter.