Test driving a 3D PDF printer from these folks:
http://www.simlab-soft.com/3d-plugins/3D-PDF-from-sketchup-main.aspx

Here is the test file I made:
http://mikebeganyi.com/sketchup/schnell-3dPDFTEST.pdf

Still have a lot to learn before I commit to a full license - but this would be quite nice to use instead of sending along a full SKP model to clients that may send it off to a competitor... (although the 3D PDF contains plenty of information - and even measuring tools, and you can look at the model geometry to get a pieces parts list!)

Pretty cool. With the full version I think you can add watermarks and such.