Free Sharing Spaces

Craigslist: http://craigslist.org/

Uniiverse: http://uniiverse.com/

Please post any other resources you know of that should be listed here as a reply and they will be added to the permanent page.
(Preliminary release/sneak peak at Guide Free U Fall 2012: https://freeuniverseity.files.wordpress.com/2012/09/guide-free-u-fall-2012.pdf )