2008 PowerTap SL build by LigeroWheels: 1634 grams for the pair (w/o tires/tubes/skewers/cassette)
Rear: 1010 grams (24 spoke Sapin CX-ray, 27mm Niobium rim, rim tape, Powertap SL)
Front: 624 grams (20 spoke Sapin CX-ray, 27mm Niobium rim, buttons, Ligero hub)
PS: Sorry, didn't reweigh them with the tubes and tires.

At least I didn't put it in my spreadsheet. I'd weigh them right now but their filthy and it will likely add 20 grams.

You could safely add ~600 grams for two ProRace2's and Performance 700c tubes. Call this setup 2310 grams on the bike w/ my skewers (76 gr/pair).
PSS: OK, you guys made me feel guilty when I re-read a couple posts. I went into the garage and weighed them dirt and all. I forgot to add the Ultegra 12-25 cassette to my 2310g. estimate above. Actual weight as ridden 2565 grams w/ dirt!