Just read this thread. That's an impressive end result! I'm just about to start a new 'light' build so this is giving me some ideas. What's next for it?
I think I'm pretty much happy as it is now. There are a few odd grams to spare here and there but this is my main ride and I need it to work reliably - I still don't feel I've compromised performace for weight too much anywhere on the bike really. A couple of things have been on my mind:
A lighter crankset, but the M752 + XT BB is actually a pretty light combination (856g togehter), and is just super-reliable. I did get hold of a KCNC crankset which shaved off somewhere around 170g, but after a week of fussy installation, retightening bolts, occasional creaking etc I decided that it just wasn't worth it. I'd consider an M970 XTR set though, which might take off 70g or so.
A boutique cassette, maybe? But it probably wouldn't save too much over the Dura Ace.
And finally - I'm still tempted to put my 502g Trigon carbon forks on this to take it sub-17.5lbs and see how much I miss the bounce...