To db4tech and other interested testers,
Here are two temporary plug-ins that will let you test SunFlow's Uber and Phong Shader:
http://www.sweethome3d.com/plugins/Adva ... r-1.3.sh3p
http://www.sweethome3d.com/plugins/Adva ... r-1.3.sh3p
These plug-ins create two new menu items in Tools menu, so you can distinguish them from each other.

To change the shininess of an object, you'll have to play with the shininess value and the specular color stored in the Ns et Ks parameters of its MTL file. If you're patient enough, try to render different existing homes in the galeries, and give us your opinion.

Please don't link these files in an other document, because I'll probably delete them once we decide which track to follow.

[Note]
2010/05/26: These two plug-ins were updated to support models at DAE/Collada format.