I used to have Trek 5.5 Madone SL Project One years ago. Tried to weight weenie it on a budget, and got it down to just under 15 lbs..

List of the parts:
Frame: Trek 50 cm OCLV 110 carbon 1100g? est.
Fork: Bontrager Race X Lite 374g
Headset: Chris King Threadless 126g
Seatpost Clamp: Krex 34.9mm 12g
Seatpost: Hylix Zero Carbon + Ti (cut) 130g
Seat: Selle SMP Chinese Knockoff 128g
Stem: Uno 7 Super Lite 83g
Bar: Bontrager Race Lite VR 230g
Bottle Cages: Profile Design Karbon Lite 27g x2
Brakeset: Shimano Dura-Ace Dual Pivot brakes 317g
Front Derailleur: Dura-Ace 82g
Rear Derailleur: Dura-Ace SS 182g
Crankset: Dura-Ace 761g
Bottom Bracket: Dura-Ace 98g
Chain Rings: Dura-Ace 39/53 teeth 143g
Chain: Dura-Ace 163g
Shifters: Dura-Ace STI Dual Control 378g
Cassette: Dura-Ace, 10-speed, 12 - 25 teeth 200g
Wheels: Farsports 38mm 1260g
Skewers: Ti 44g
Rim Tape: Stans 20g
Innertubes: Vredestein Latex 50g
Tires: Continental Grand Prix 4000 S II 210g
Bike pedals: Speedplay X2 SS w/ Ti spindles 153g