There's no peer to peer network at present that can on its own cope with the usability testing demands of the Open Source toolkits at the level of complexity of OpenOffice or Chrome. On the other hand, there is Sun and Google, looking to leverage Open Source contributions by making those toolkits Open Source. A need for corporate contributions to user testing of large scale applications would be a hurdle if there were not the corporations with an incentive to make those contributions.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.