I've been going through all the motions of buying and old road bike and fixing it into a fixed/free bike. Spending time at my LBS, reading this forum, etc.
But I just got in contact with a local guy who has pre built ones for less than it would cost me to build one.
I've always enjoyed doing things on my own, as you can learn a lot from building.
However, I wouldn't begin to attempt to build the wheel anyway (the predominant piece on the bike), and it the deals are pretty sweet.