Do you have a very concise source that will answer the most immediate stumbling block to even considering this idea: how will you enforce contracts? Every time I ask I either get pointed to web sites that probably answer my question somewhere (but I'm not the one selling anything here so I don't feel the onus to do most of the work) or told about private contract enforcement agencies. Since the bulk of what government is is violent force or threat thereof, wouldn't this just be privatized rent-a-governments?

I think one of the links mindcrime provided attempts to answer that question briefly: http://www.ozarkia.net/bill/anarchism/faq.html#part16

However, I don't feel it does a very good job. It basically devolves into private security provided a la mafia protection money or what's been seen in Sao Paolo / Rio de Janeiro with the cops enforcing payments from the populace for keeping the riff-raff out, while running their own schemes. Likewise, I can very much see the whole law system being subverted to benefit those providing the most cases (thus helping the bottom line) or benefiting a certain plaintiff over another, like with the eastern district of Texas handling so many patent cases.

Overall, the response seems incredibly wishy-washy with little thought paid to the ways the system can be significantly subverted.