Transaction.net

Community based and real backed currency models are discussed in depth on this awesome site I found through Steve's blog, dy.onis.us

This is crucially important stuff if we are to create the world we dream about. Our 'economic' system is completely surreal and severely fucked up, and needs to be rebuilt practically from scratch. This is a very intelligent site and I encourage you to explore it.
http://www.transaction.net/money/lets/