Another thing you can do with Blender is to transform an entire 3D scene to bas-relief for CNC wood carving. The code is not included yet in actual version (2.49a) of Blender but a patch is provided so, you can build it yourself.
Starting Blender 3D scene.
Bas-relief transformation. Please note, is still a 3D scene, not a 2D height map image as here.
- Reference: Pildanovak