Makeblock is a sweet aluminum building set that has facilitated the creation of some cool projects ranging from nanoscopes to xylophones.
Stijn Kuipers is using his Makeblock to build a PCB mill with two rotary tools, one for boring the vias, and the other for milling the traces. It uses three microstep stepper drivers, one for the Y and two to control the Z for the drills. The idea is that Stijn can set up his PCBs to fully mill on a single machine. Pretty sweet!