I've been thinking about going fixed gear on the other road frame I have... but it's carbon so I don't think that's the best match for fixed gear riding. I can hear teh carbon snapping now as I lock up to skid... oopsie!
Haven't weighed the TCR yet but I suspect that it's sick light. my MTB was disgustingly light when I went singlespeed. It's amazing how much noticeable weight is added with the cassette, deraileurs, shifters. I think my mtb was sub 20.