I'm in the process of setting this up for myself. I've determined that buying DSL will allow me to telecommute 1 day/week and save money, based on my gasoline costs.
My husband spends around $18 a day for gasoline. If he could work 4 ten hour days a week or telecommute for one day, we could use the difference to up the speed on our internet AND save wear and tear on the car.
Employees should start asking and negotiating for more flexible work schedules, if they're possible. Just by altering their rush hour times by as little as an hour, a lot of gas could be saved (not to mention aggravation during construction season!)