I was excited for a moment when I saw this in the news.  I've been having fun playing with a free renderer http://www.softlab.ntua.gr/~jpanta/Graphics/Kerkythea/ that has a SketchUp import module.  Then I saw that the free version will only create Google Earth files.  It may be worthwhile if you can get .obj out of it.  I have Ogle but I haven't used it for anything yet.  From the descriptions, SketchUp could be a real nice tool for creating buildings especially.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken