PCB-GCODE is a user language program (ULP) to convert Eagle .brd files to G-code. PCB-gcode creates g-code files to allow you to cut out a printed circuit board using a router or milling machine. As posted in the PCB-GCODE yahoo group. http://groups.yahoo.com/group/pcb-gcode/ It is also configurable with the following options:

o Easy to use setup screen!
o Create files for the top, bottom or both sides of the board.
o Select if you want to cut out the traces for one or both sides.
o Select if you want to drill holes from one or both sides.
o Choose how many passes you want to make when cutting out the tracks, and choose how far apart the passes are.
o Quick setup for your machine's controller using Profiles.
o Automatically insert your own g-code into some or all of the files produced.

Looks like some great add on's: http://cnc.goodbits.net/wiki/index.php5/Pcb-gcode_optimizer PCB-Gcode Optimizer and patches by KC6QJO