I've been looking at getting some suitable cutters to have a go at this myself - had a project or two in mind that haven't been started because I haven't decided how to make the PCBs. With auto-levelling software available, though, CNC machining looks viable with my machine.

I'm a bit confused about cutter choice, though. I see "PCB drill/mill" listed on eBay (although they look like milling cutters to me), or V-bit engraving cutters. Cropwell mentions using both, and then there's a wide range of diameters. Could someone recommend a good starting point for making, say, a PCB suitable for 0.1 pin spacing DIL packages (no SMD!)?