Ramon travelled the world from May 2001 to July 2003. He did so without any money, relying on people who had agreed to host him through his website. His invite-me-over page
Inspired by online schemes such as SendMeADollar and the RedPaperClipGuy, he gained sponsorship to help him travel the long distances, and hitchhiked the rest.
Read an extract from his book (translated from Dutch) on WorldHum.