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@rpm
Guys, just so nobody gets confused reading the last page, Dura Ace track cranks in Octalink are NOT external bearing types like the ones pictured. The Octalink 1 system is just a normal BB with a splined axle instead of square taper.
It's still quite rare for ext bearing hollowtech systems to be used for track, because of the Q-Factor. FSA do one however, not sure what it's like.
Oddly, Evans cycles have a neat little page explaining the many types of BB available
http://www.evanscycles.com/buying-guides/bottom-brackets