Thingiverse is getting big. And still there are no good alternatives.
or myminifactory, even better designs that thingiverse. if you like the designer work, you can tip them
Thanks for the tips!
I left Thingiverse for @YouMagine when Makerbot Industries turned into Takerbot.
The embedding of designs into my own blog posts (similar to embedding YouTube videos) is great. As is the metadata for files. However the messaging system is currently being rewritten.