You need to support the MakerSlide. It is an open source linear bearing system which will enable makers and innovators everywhere to make better machines and tools for makers and innovators! Linear bearings are key components in CNC mills, routers, and laser cutters, and having this component available in open source form lets those machines be made easier for the creator, and easier for kits and DIY (e.g. MakerBot).
So please pledge some money towards the project. At least visit the site and look at the nice pictures!