ok, call it an obsession. spotting fixies is fun! especially when you aren't looking for them. i found one today on six apart's (movable type, livejournal, etc...) website. i am pretty sure it's one even though you can only see the handlebars sans bartape or brakes!
visual proof! and the office is in sf which gives it a bit more credibility i guess.
have you spotted any in the wild on accident as well?