SS and fixed are getting more popular by the day here in DC. Lots of couriers use them and commuters too. There is a LBS that sells a lot of fixed gears and SS and I have run into a few people that have bought them there. Case in point, I was commuting on my geared bike yesterday and I come upon a guy riding a nice new Trek frame ('think' it was Trek) that turned out to be a SS. I ask the guy what gears he is running and he tells me it is fixed (it wasn't since he was freewheeling at the time). So I ask what gear ratios he is running and he can't tell me. Then I ask him if he bought it at the LBS. Bingo!
All in all a good thing. But there is something weird about seeing a nice, shiny bike with one gear in back. Like seeing the Chrome Pista. I am not used to it yet.