FLfixed.com is the main message board for the Tampa fixie scene. Some really cool people but also a lot of people that just annoy me.
Michael at 66 is a top-notch great guy. Prices are kinda high compared to the internet but still very reasonable considering it's a specialty boutique shop.
I was tempted for a long time to build a fixie but never did. Still might, but I'm too involved with other things right now. Maybe as a summer project when it heats back up and the air conditioning looks increasingly attractive. Right now it's too nice not to be riding.