I've never really listed it all out before, but I did it as a request on another board, so here is the list of everything that made my S2 13.5lbs.
Frame : Cervelo S2 54cm
Fork : 3T Funda Pro
Headset : FSA Orbit
Top Cap : Parts of Passion carbon with alloy bolt
Stem: 3T ARX Team 120mm
Handlebars : FSA K-Wing Compact 44cm
Bartape : Fizik Microtex Gloss Black
Seatpost : Cervelo S Series Tuned
Seatpost Collar : Cervelo S2 bolt changed to Ti
Saddle : Selle Italia SLR Kit Carbonio Flow
Wheels : Zipp 404 tubular (15g of stickers removed)
Tires : Zipp Tangente 21mm
Skewers : KCNC
Crankset : Lightning 170mm (logo removed)
Bottom Bracket : Zipp Vuma Quad cups with standard Sram BB30 bearings
Chainrings : 50t Stronglight CT2, and 34t Extralite
Chain Catcher : Far and Near
Pedals : Speedplay Zero Pedals, tuned with Ward Ti Spindles (159g/pr)
Chain : KMC X10-SL
Cassette : Sram Red 11-23
Front Derailleur : Sram Red
Rear Derailleur : Sram Red (minor tuning 140g)
Shifters : Sram Red
Brakes : KCNC w/ Swiss Stop Yellow Pads
Cables : Jagwire
Bottle Cages : New Ultimate
As pictured:

except I put these chainrings back on, because the Sram ones failed in under a month.
