I am a fan of google sketchup and how easy it is to do 3d modelling with it. Unfortunately their file format is closed and the kml export is totaly unuseable. But yesterday i found this nice obj export script for Google Sketchup:

http://sketchuptips.blogspot.com/200...-exporter.html

It needs some tweeking and improvement. But it does its job nice for single non materialized meshes.