everything you never wanted to know:
http://www.sheldonbrown.com/raleigh-twenty.html
i'm in the midst of an old phillips (raleigh under a different name or something...) twenty fixie conversion. if it weren't for lack of funds and inaccessible hard to find parts, i'd be rolling ages ago.
this is a sweet ride:
http://www.fixedgeargallery.com/milam.htm