This thread is a place to share links to sites which provide 3D content under a creative commons license, if you wish to post a link, feel free to do so, just be sure to point out which license it is released uner:  

http://resources.blogscopia.com/category/models/

Plenty of modern interior furniture, bathrooms, kitchens, loungerooms. its all quite high poly, but with a bit of decimation should be usable in game. All under CC by 2.5 or 3

http://www.esi.uclm.es/museo/index_en.html

A good collection of computers and consoles, all under CC by 2.5, again, quite high poly, but they react well to decimation.

http://e2-productions.com/repository/modules/PDdownloads/

The official Belnder repository, a fair sized collection of blender models, the licensing is strange, they say totally free in one place and then copyright in another, still looks to be cc by 0