Sounds like a great commute for an electric bike, I really like my hub motor, the hub motors that
ElectricRider.com sell are really nice and are really a 72v motor so you can increase the top speed with their 72v controller and a higher voltage battery pack so you can go faster then you would ever want to go on a bicycle.
You might also look at buying an electric car, check out the link to the commuti-vans that Ben Nelson linked to a month or so back, the vans had a top speed of 55mph with a claimed range of 50 miles or so, so figure 35-40 in real life and if you can charge at work then you get that full range on your way home.