I just has to post this. “MAKE’s yearly open source hardware guide is now online with over 125 projects in 19 categories. The creators of all of these projects have decided to publish completely all the source, schematics, firmware, software, bill of materials, parts list, drawings, and ‘board’ files to recreate the hardware. They also allow any use, including commercial. In other words, you can make a business making and selling any of these objects. This is similar to open source software like Linux, but hardware-centric.”
The definitive guide to open source hardware projects in 2009
Have fun!