Wikitravel rocks! And it's only getting better... with your and my help.
From the site:
"Wikitravel is a project to create a free, complete, up-to-date and reliable world-wide travel guide. So far we have 2665 destination guides and other articles written and edited by Wikitravellers from around the globe. Check out the Help page to see how you can edit any page right now."
Free the Sounds
Interested in music in the public domain? There is a lot out there, including Archive.org, Opsound and etree.org. There is also a new project for online collaboration of music, sounds, loops and samples in the public domain called Free the Sounds. If you are a musician and want to share and collaborate, this might be a good place for you to get moving!
Are you a world traveler? Ever wanted to stay on a hostel sailboat? It's not free, but it is darn close! Hostel Happy has a sailboat for hosteling adventures in the Caribbean and Mediterranean... as close to free as you can get for this type of styling world travel adventure!