3dshap.es is a new 3d model search engine that doesn't use keywords but you can upload your own 3d model and look for similar ones. This could be very useful in specific cases, i.e. when searching for copyright violations.
It is currently in beta and searches only Thingiverse, but new searchable 3d model repositories will be added in the future. I would like to see more detailed review on how sensitive it is and how it works internally.
I also wonder how will Yeggi respond and will we have the 3d model search engine wars soon.
I almost wrote in the post title 3dshap.es wants to be Google for 3d models, but I decided it was to hypish.