Something very cool
you can export from Free Google Ketchup to the free Kerkythea with no limit of size for the rendering!

You can also export directly in Kerkythea from Moi in format OBJ ;)

Exporter is su2kt 3.0
http://www.kerkythea.net/joomla/index.php?option=com_remository&Itemid=42&func=select&id=7
Kerkythea http://www.kerkythea.net/joomla

It's better than the 500*500 of Podium (in free)

Here my try of Podium model by Michelle Kaufmann (it is not a Moi model) you can load it at Warehouse http://sketchup.google.com/3dwarehouse/search?q=michelle+kaufmann&btnG=Rechercher&styp=m



and my try with the same in Kerkythea