I found a really interesting link on fixed gear gallery. Maybe some of you have seen this...perhaps all of you have seen this, I would gather that most of the readers of this site also check FGG. Ether way, this is an artical discussing the physics of riding fixed. Now, I don't know all that much about classical phisics, I'm more of a quantum guy. But, I do know that John and I were on a ride today, both of us on a fixie, and about midway through we were passed by a dude on a pretty standard road bike while making a sustained push into a headwind. I was in the lead at this point, so I tucked in behind our 'benefactor'. After a mile, I slacked off a bit, but we still hung within twenty feet of the freewheeler. Coming back into Bozeman from the East on Frontage, there's a pretty good climb up what turns into Main Street. It was here that DNA and I blew past the guy on his high end carbon road bike using good old fashioned American muscle (just not the kind you find in a '69 Chevelle) and even though I was dying on the downhill, we never saw the guy again.
So when you reach into the quiver, remember, not only do you look like a badass on that fixie, but you have a ninja-like advantage as well because you and the bike have a spiritual connection not afforded by other 'technologies'. Also, the 'laws of physics' are on your side, although I'm not sure what advantage that is.