I'm a member of a group that in the past couple days worked on an implementation of a decentralized, free market. This is not drug aimed like most "free" markets involved with bitcoin. This is to markets what bitcoins is to banks, we believe.
Abstract from in-the-works whitepaper: A decentralized open market would allow online transactions to be done directly from one party to another without going through any central point of failure. Digital currencies, such as bitcoin, provide part of the solution, but they do not eliminate problems such as having a central escrow system that could possibly steal users money. We propose a fully distributed market, using Nash equilibrium to provide an equivalent of escrow that does not require any 3rd party. Such a system could rely on existing infrastructure, such as a blockchain-based currency to store data in a distributed fashion.
(pre-pre-pre-draft explanation)
https://ghostbin.com/paste/4k7y6(original irc log of the discussion)
https://ghostbin.com/paste/oweqm(reddit discussion)
http://www.reddit.com/r/Bitcoin/comments/1ryf4z/cryptoanarchy_round_two_fully_decentralized_free/