I was reading about those r-sys wheels a while back. "it uses tubular-carbon spokes that resist both tension and compression".. there's something to be said for comfort, and that sounds like a complete ass-buster to me!

I was also reading something on bike hugger about the newer HED carbon clinchers. The rim is actually wider than a normal road rim, so regular road tires wind up stretched out a little more. The dude said the same tires mounted on those rims felt far more supple, seemed to roll just as easily, cornered very nicely, etc. Pretty simple, but interesting.