After Limor Fried yesterday, another entrepreneur in the field or open source hardware is featured on Entrepreneur.com: MakerBot's CEO Bre Pettis.
For those who don't know Makerbot: it is a 3D printer that produces objects made of plastic from 3D files. You can order a kit and build your own, or optimize and change the machine.
(follow the link for the video)
I find the tips Bre gave in the video very helpful for people who plan to start an open source hardware business.