Nice!
I've never owned a car, so I can't really make an accurate picture of how much I'm saving my commuting by bike. I can only guess that the money for gas + insurance + maintenance + parking would add up to quite the sum, which I am happily squirreling away for a rainy day (or a downpayment on a home).
The best part is, when I stop by the bike shop and ring up $50 in tubes, brake pads, and chain lube - I don't give it a second thought