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…is actually a disc-brake mountain bike hub.  Check this out: http://www.londonfixiebike.co.uk/

So, you get a mountain bike hub that has a disc brake set up.  You flip it around, and you bolt on a special cog.  It uses six bolts (same as a brake rotor) instead of threads.  It’s brilliant!  It’s guaranteed for life!  I can’t wait to try it… there would definitely be no stripping of hubs or lockrings or cogs with this system.  Seriously, awesome.  This is good bike engineering.  From now on, I’ve decided that Track Hubs Are Officially Dumb.

Amended 2008-10-07: You can buy these cogs in the U.S., too! http://tomicog.blogspot.com/

Amended 2009-03-18: My 16t Tomicog works great, but I wish I had ordered a 17t or an 18t first.  Since I’m using it in a road application, and 16t is the smallest offered, I was running 42×16.  That’s pretty low when you’re used to 46×16.  So I have ordered a 17t cog, and I’ll run 50t on the front – but the ideal setup I’d probably recommend is 52×18.

Also, the cog didn’t fit perfectly over the disc holes – they were a little wider than the holes on the hub. That means it fits, but I get a tiny bit of fore/aft play in the chain.