Over the last few years, collaborative Wiki and Open Source projects have exploded in popularity, usefulness, and legitimacy. The successes of projects like Linux, Wikipedia, and others show how well this type of development can work for software and information based enterprises. Recent projects such as Fab@Home are pushing the open collaboration mindset towards engineering problems in the physical realm. CR4 is itself a great example of open collaboration.
There are many advantages to such efforts, namely access to global human resources. The free open mindset has lots of appeal to lots of people. It can give them the opportunity to gain experience by watching and in some small way helping a large scale project come to fruition. However, things can get complicated when issues like intellectual property and commercial opportunities come into play.
I'd like to see what other people think of this type of project moving into the physical realm, or in general. What are some possibilities? Advantages? Disadvantages? Impacts on various industries?