Just a quick heads-up for anyone that uses Sketchucam, a new version was released last month which has quite a few updates and new features. It looks like you need to register to download it now, but it is a 'free' solution for simple gcode generation from within Sketchup.

There is also another plugin for Sketchup in development at the moment for use with 3,4 and 6 axis machines which is getting close to completion : Sketchup Plugins for use in Aircraft Design | FoamCasualty

Si.