We just released Screen Space Ambient Occlusion on http://sketchfab.com, you can now fine tune it from your edit panel.
Here is a blog post on how it works: http://blog.sketchfab.com/say-hello-to-ssao
And here is a nice model with SSAO:
<iframe frameborder=“0” height=“480” width=“700” allowfullscreen="" webkitallowfullscreen=“true” mozallowfullscreen=“true” src=“http://skfb.ly/k43ge0b?autostart=0&transparent=0&autospin=0&controls=1”></iframe>