Went to a presentation by Austin Vince last night (no I didn't have a clue who he was either). Turned out to be excellent! You can find out more about him here Mondo Enduro (http://http://www.mondoenduro.com/). He spends his spare time riding around the world (twice) on a trail bike.
He is an anti-consumerist in that he won't by a $15,000 BMW like Ewen Mcgregor, he did the rides on a second hand $1,000 350cc trail bike.
He is a great speaker if you ever get the chance to see him talk take it, he's very funny as he tells the stories of his experiences.