One of my ongoing projects has been building my own CNC routing machine.
It's a great tool have for making PC Boards and custom parts.
It's also a great way to make yourself crazy!

Klunk CNC Mini CNC Controllers Links

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	Klunk: My original attampt to build my own machine. Built from printer parts and hardware store components. The build is photo documented. I used a different parts configuration for each axis
	Mini: I built this mini-cnc in two days in an attempt to drag it to the Maker Faire. It's made from Sam's Club cutting boards, 1/4" all thread, 1/4" rod and machine screws.
	Control Circuits: This is a classic Unipolar controller built from UCN5804Bs. It's very, very economical at $22 in parts. I also designed a bipolar stepper controller, but the part count is very high. Samples offset the costs, but I prefer the unipolar design for simplicity.
	I used microstep boards to build the controller for my mini-mill. These are well designed, cheap to build and support microstepping.
Software	K-Cam is great for testing with a windows box. Once you know it works, check out something realtime like EMC Linux There's a brain dead install that's (relatively) easy to setup. You can run the interface remotely too.