The Tarahumara of Mexico have been getting a lot of play recently specifically because of a book called Born to Run, by Christopher McDougall (http://www.amazon.com/Born-Run-Hidden-Superathletes-Greatest...).

The Tarahumara people have been known in the elite runner/super athlete circles for a few decades yet but it seems that since the book came out everyone has been searching for their own experience with them. They are also somewhat responsible for the recent barefoot running phenomenon.