You can manipulate Collada (.dae) 3D objects in Lion.
I was converting a Sketchup 3D file to Collada to be able to open it in Cinema 4D when I noticed the Finder icon generated was looking same as the model. I could Quick Look at the file and discovered that you can manipulate the whole 3D right into Quick Look, or Preview.
[crarko adds: I haven't tested this one. The file type is one that is used for a lot of interchangeable 3-D graphics modeling in various game engines.
According to several comments, this also works in Snow Leopard.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20110913092408802