Check out this link. Its results for me:
You have burned 286.20000000000005 calories.
You have saved $3.38 by not driving.
You have saved the earth 6.5 lbs of toxic emissions.
Multiply that times the number of days I bike to work, and that's not too shabby. Now, it's not perfect - the amount of money I save doesn't include how much I'd pay for parking at OSU for work, but it's close.
People, not speed.