My 2008 costs:

$30 for approx 3 tubes and two Michelin Dynamic tires per year. I ride with Mr Tuffies, which really cut down on flats.
$10 got a used 105 derailer. (I shop U-Pull-It for car parts, similar joints for bike parts)
$1 new shifter cable
----
$41

I have a tubular wheelset for pleasure cruises, so I don't count the approx $100 a year I spend on those tires.