jack of one or two trades
Join Date: Jun 2005
Location: Suburbia, CT
Bikes: Old-ass gearie hardtail MTB, fix-converted Centurion LeMans commuter, SS hardtail monster MTB
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Another option, especially for offroad fixes, is the disc-adapter. Boone and a couple other folks make cogs that bolt onto the disc brake interface of MTB hubs, thus running your bike as a fixed gear. Alternatively, you can just drill a cog of some sort to fit.
It might be possible to do this with disc road hubs (for non-MTB spacing frames), but I don't know of any that have the 130mm or smaller spacing.