Congratulations!
Not to hijack your thread, but, I am also a new commuter. Started in Sep 06, after winter storing my sportbike which I used for transportation. Anyhow, I have now covered over 2600kms since I started and March will be my record month (600+kms). I have got to a point where I am seriously thinking about selling my sportbike as I have no desire to use it for commuting. I have also started to take the long way to work. The health benefits are amazing, you can enjoy food, I question the $$ saving though, as most of my savings go into 'accessories' for the bike and clothing ;-) (merino wool is your friend). I would also encourage you to get a decent bike. I had a walmart-type bike initially when I started but then invested in my current commuter. It made the experience so much better! Now I dream of new frames/components, and century rides...
Welcome and enjoy the new life style.