I weighed my 9.9 (medium) in the stock setup (aeolus 6.5 wheels/SRAM red), including the draft box (empty) and my 2007-model dura-ace pedals - 19lbs.

My 2010 Madone 5.1 with zipp 606 wheels weighs in at 17.5lbs.

This is on a bathroom scale that displays in increments of .5lbs. No idea how accurate it is.