The P2P Foundation, who recently issued their annual 3D printing survey, have come up with another survey specifically to analyze Thingiverse.
Thingiverse has become the most notable 3D-model-for-3D-printing free repository, now boasting over 100,000 3D models. But with that size comes questions. Are these things publicly viewable or private? Why upload things? Have you modified things? Is your thing for business or pleasure.
These and many more questions will be answered - but only if you fill out P2PF's survey. Check it out before September 30th.