List of components & weights

I'll update this as things progress...

 ...updated 04/10/2012: 7615.4g - initial guesstimated total weight; excluding cables & tyre sealant

 ...updated 08/10/2012: 7752.4g - more actual weights; excluding cables, tubeless valves, & tyre sealant

 ...updated 12/10/2012: 7677.4g - XT cassette out, XTR in; excluding cables, tubeless valves, & tyre sealant

 ...updated 16/10/2012: 7656.2g - more actual weights; excluding cassette spacer, cables, tubeless valves, & tyre sealant

 ...updated 22/10/2012: 7639.5g - minor revisions; excluding cables, tubeless valves, & tyre sealant

 ...updated 03/11/2012: 7668.5g - more actual weights; excluding cables, tubeless valves, & tyre sealant

NB:
 - 'total weight' excludes 'miscellaneous' components (bottles & cages, computer & lights) but does include pedals.
 - 'as supplied' denotes weight reduction potential, e.g. by shortening, substitution of titanium fittings, etc.

frameset: 1953.3
 - frame - 1515g (including downtube cable adjusters & bottom bracket cable guide)
 - fork - 318.3g (including star nut)
 - headset - 120.0g (as supplied, but excluding 10.5g star nut)

steering: 361.6g (estimated)
 - stem - 157.7g (as supplied)
 - headset spacer - 1.0g
 - handlebar - 142.4g (as supplied)
 - grips - 60.5g/pair (as supplied, including bar end plugs)

seating: 548.2g (estimated)
 - seatpost - 160g (claimed)
 - seatpost clamp - 23.3g
 - saddle - 364.9g

wheels & tyres: 2392.2g (excluding sealant)
 - wheelset - 1755.5g (including skewers, excluding valves)
 - tubeless valves - 13.7g/pair
 - tyres - 623g/pair
 - sealant - ?

brakes: 559.3g (excluding cables)
 - calipers - 389.7g/pair
 - levers - 169.6g/pair
 - cables - ?/pair

drivetrain: 1876.9g (estimated)
 - bottom bracket bearings - 103.5g
 - crankset - <500g (estimated, after modification)
 - chainring - 139.1g (as supplied)
 - chain - 242.5g (110 links, including 2.5g Powerlock link)
 - cassette (XT) - 350g (claimed)
 - cassette (XTR) - 271.6g
 - cassette spacer - 1.8g
 - derailleur - 174.3g
 - shifter - 119.5g (including inner cable)
 - outer shifter cable -17.8g
 - pedals - 306.8g/pair

miscellaneous: 705.1g (estimated)
 - bottle cages - 58.0g/pair
 - bottle cage bolts x 4 - ?g
 - bottles - 151.4g/pair
 - computer - 76.5g (including magnets; excluding zip ties & heartrate chest strap)
 - front light - 215.5g (including handlebar mounting bracket & 4 x Eneloop AA batteries)
 - saddle bag & rear light -198.9g