I shared the train with two singlespeed riders this evening. On the right is Katie in Palo Alto with her brand-new Bianchi San Jose singlespeed cross bicycle. She tells me that about four of her co-workers at Facebook also ride singlespeeds and fixies.
On the left is Kyle in San Jose with his Centurion. He bought the bike for eighty bucks and replaced the rear hub to convert it to singlespeed. He plans to get a flip-flop hub so he can freewheel on one side and go fixed on the other side. Rock on.