Anyone tried BlenderCAM for producing the gcode? Looks fairly good and cross platform so should be good for those like myself who run linux. 
http://hackaday.com/2013/10/19/blender-cam-open-source-cam-software/
The code has undergone a major cleanup lately.
Expect more improvements soon.
WOW … this looks great… Would love to give it a go… just might try it.