Bart Dring has been designing and building his own CNC machines for about 10 years. He has done multiple versions of routers, lasers, 3D printers and most recently a plasma cutter. All of the machines are open source designs with close to 1000 machines in the wild.
Bart ran a successful Kickstarter project for a product called MakerSlide, a low cost linear bearing and frame member in one piece. Many machines are based on it including the very successful ShapeOko router.
Bart currently runs a website dedicated to DIY CNC called buildlog.net. Buildlog.net is place where people can post build logs of their CNC projects. Build logs are sort of like a daily diary of a project. It allows people to follow your project, give encouragement and give advice. It has over 2000 registered members and close to 13,000 posts.