Remo has posted his thesis about open source hardware. We covered this previously, but the thesis was not available publicly:
In this website you will find my Master Thesis
Open Source Hardware Fostering User Entrepreneurship: Empirical Evidence from Arduino Users
and the abstract of a working paper I am going to present at OHS 2011:
Spurring Creativity in the Marketspace: An Evolutionary Model of Social Hardware
more info about OSHW Business Models coming soon
Via the comments.