1. Converted my crappy 10 speed to SS in July of 2007, then went fixed in October. Had a few friends who rode fixed and raved about it, read Sheldon's site, saw bike porn, gave it a shot.
2. First bike was a conversion, still in service but is now the beater.
3. Philadelphia, PA
4. This doesn't apply because it's not a small city, but I'd just like to note that like 1 in 5 dudes between the ages of 18 and 30 rides a fixed-gear bike in Philadelphia. Seriously they're everywhere.