Where to Spend Your Money To Gain Speed

The VeloNews 2010 Buyers Guide had a great article on where your money is best spent when it comes to gaining speed in time trials. Here's a breakdonw in the seconds saved for a 40k time trail:
road jersey and bibs to a skinsuit 134 seconds
upright on regular bars to normal aero bar position 122 seconds
road helmet to aero helmet 67 seconds
normal tuck to improved aero tuck 56 seconds
no shoe covers to shoe covers 30 seconds
standard tt bike round tubes to aero tubing tt bike 17 seconds

This may explain why buying that expensive aero frame didn't make you go any faster.