Conan Obrien is 6’4 and rides a Ti Serotta something-or-other*. Check out the EPIC head tube! I would be willing to bet that fork (its uber-long steerer tube) had to be custom made:

He was probably professionally fitted for that bike, but there must be something about the really tall guys that just makes them look not-quite-right on a bike.
Edit: Wow sorry about the HUGE picture 
Second edit: * Looks like an Otrott