Using of loose atmosphere, if someone don't know this blog yet - http://procworld.blogspot.com/. It's quite inspirational for me.

So, generally - this guy is making completely procedural voxel world, that is extracted to meshes, via OpenCL dual-contouring (i'd love to see that in polyvox btw.).
One of his latest videos:
http://www.youtube.com/watch?v=3JmDjRqBbTI
It's not only about terrain:



Nor geometry:
http://procworld.blogspot.com/2011_07_01_archive.html

I hope you like it.

Yes, this is a cool project I've been following the blog for a while and hope we can see a demo at some point.

Regarding the Dual Contouring, I don't have any plans to implement it myself but it should be possible to add it as a new surface extractor.