Don't worry, the low Friday morning should be 16 F out in the 'burbs and closer to 20 F in DC. My coworkers are really going to start worrying about me if I ride in.

For anyone interested in seeing a very scenic bike commute, I've attached (or at least tried to attach) a zipped KML (opens in Google Earth) showing my route to work. I start in Alexandria near Old Town, then go by the airport, then down the Mall toward the Capitol. Neat perspective in Google Earth.