Open Capital
A proposal for peer-based market reform by Chris Cook, at http://www.opencapital.net/
"Open Capital is the concept of partnership finance through the sharing of risk and reward. Risk is shared through a guarantee society or clearing union, where trade credit between buyers and sellers is subject to a mutual guarantee. Revenues are shared through co-ownership of a productive asset by the investors and investees."
See also: http://www.exchange-handbook.co.uk/articles_story.cfm?id=38754
For a debate on the similarities and differences between cooperative capitalism and peer production, see http://blog.p2pfoundation.com/?p=93