I ride my bike, 12km(6miles?) each way.
Pretty cool ride, paved paths the entire way though at the times I ride I rarely see anyone else.
Takes 30-60mins each way depending entirely on how tired I am. Good way to sneak exercise in around a busy schedule, is advocate bike-commuting to anyone, just stay off the roads, cars don't notice you.
Also cut my transport bill from $50 per week to $0 when I made the switch.