Interesting concept, peer-to-peer decentralized freelancing market. It is similar to the Rein project. Win-win situation for the reviewers/stakeholders, 10% of task value in case of a dispute or task fees if there is no dispute. The system does not rely on reputation to assure fair task evaluation, this is tricky. Irrespective of their percentage of stake, reviewers are selected randomly right? It is good, but in the case of a dispute, it is necessary to have reviewers that are qualified enough to have a fair evaluation of the task, right. How is that going to work? The currency would be TaskCoin only, no Bitcoin, right?
Good luck with the project.