Here in Boston you have a lot of messengers with single speed/fixed gears, which is how I originally got into it. I had (God rest her soul) an old Univega I converted to single speed, and not only are they more efficient, but they are very quiet, especially if you're used to a geared bike. I was amazed at how much more enjoyable not having to worry about gears and the sheer silence made recreational riding. And geez, the bikes are just oh so sexy....