Ollie Whalley crushed the Tour Divide record this year, completing the race in record setting time. Ollie, from New Zealand, used two items that I find most interesting. First he went with a Rohloff hub and second he went with a Gates Carbon Belt drive. Two drive train components that you don't often see in races where weight and durability are an issue.
You can review Ollie's complete gear list here. I have been contemplating the use of a Rohloff on my next touring build and Ollie's success lends a great deal of credibility to this type of setup. If you have any experience with one I would love to hear about it.