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If you're thinking of vector drawing on your CNC then it might be worth checking out the pcb-gcode Yahoo group. The software is an extension to Eagle for isolation routing your board. It is intended for use with a mill but should work just as well for a laser / focused LED and allow for compensation for the beam size. Of course if you're not using Eagle it's no use to you.
I've got a 40W CO2 laser and might try this at some point for burning paint off the copper rather than using it with a photosensitive board. Too many other things in the pipeline at th emoment though.
http://nothinglabs.blogspot.co.uk/2013/05/2-layer-circuit-boards-using-laser.html
This also might be of interest
http://hackaday.com/2012/08/09/exposing-pcbs-with-a-home-made-laser-printer/
--- In Homebrew_PCBs@yahoogroups.com, <homebrew_pcbs@yahoogroups.com> wrote:Hello...
Long time ago I remember that someone has UV laser mounted on inkjet printer and developing photoresist on pcb directly.
I'd like to know is someone has making some test with cheap 3W UV LED instead laser. I think the power from LED can be focused on pretty small spot to cure photoresist. But don't have any idea how long should take to.
My idea is to use focused LED to aprox 1mm spot and then to use some mask (like aperture whell) to do finer trace. And to use vector instead raster imaging.