I recently wrote a couple of posts at Suite 101 that show you how you can travel for free around the world. Pretty much, anyway.
In How to Travel Around the World for Free, three major ways of traveling free or reducing travel costs were suggested for budget travelers including couch surfing, volunteering, and how to hitch-hike or cut transport costs.
Here's an excerpt:
Volunteer for Free Around the World
One of the most reputable organizations in this field is WWOOF: World Wide Opportunities on Organic Farms. WWOOF “links people who want to volunteer on organic farms or smallholdings with people who are looking for volunteer help.” They have farms all over the world from New Zealand, to England and Italy, to name a few of the diverse locations in which travelers could spend time living for free.
The way it works is that “in return for volunteer help, WWOOF hosts offer food, accommodation and opportunities to learn about organic lifestyles.” Potential volunteers contact the farm or garden directly and arrange their placement with them, after paying a token registration fee to join the WWOOF network.
More Ways to Travel Around the World Free includes links to a few great organizations that help reduce your lodging costs to almost zero.
Here is an excerpt: