A tax break for bicycle commuting, by itself, I could live without. But being that other forms of energy efficient/lower pollution commuting get breaks, why should cyclists not? The main thing is to me that the recognition, on the federal level, of bicycles being viable transportation, would be very, very good.
Pinhead: "Bicycles don't belong on the road."
CR: "Really? Then why does the federal government give me a tax credit as a low emissions vehicle?"
Pinhead: "<Fume>."