I just started reading Long Way Round, the memoir written by Ewan McGregor and Charlie Boorman about their motorcycle journey around the world. Very interesting stuff. They took a second trip as well, from Scotland to South Africa (the first went from London to New York), and, in addition to the book, filmed both journeys. The first documentary aired on the BBC - the second, Long Way Down, will show in a number of theaters on July 31, for one time only.
McGregor also talks with the /film podcast about the journey.