Almost finished reading the Mondo Enduro book... probably one of the most inspiring travel writeups I´ve ever read. And very well written, too.
Once in Indonesia, I met a Russian couple, who had no money, and had literally walked there from their home (for 9 months) with their backpacks, sleeping in the wild, cooking their own food, eating stuff you can find from the jungle, etc. I think these Mondo guys had some of the same attitude. This kind of travelling is surely not for everyone, but even reading the book has been a great experience!