Example uses for voronoi fracturing / shattering tools and voronoi cell point placement and real-time demonstration of some things I'm working on.
Developers: I've released voronoi fracture and shatter source code for Bullet Physics under permissive open source license (even your favourite commercial software could incorporate this feature).
Sorry artists, unfortunately I haven't worked on my "Phymec Tools" for Blender the last 8 months, so there has been no progress, still lots to do. I don't know when my physics tools will be released; I work on this in my own time for the fun of it.

Voronoi fracture and shatter open source code for Bullet Physics (for developers only!): http://bulletphysics.org/Bullet/phpBB3/viewtopic.php?f=17&t=7707

All voronoi fracturing and shattering and physics simulations shown in real-time, no cuts or speedups. Currently all single-threaded. PC: Intel i7 720, AMD HD4890, Windows 7 64-bit, with screen capture software running simultaneously on the same PC.

I'm creating some simple voronoi fracture and shatter tests and a video of the rendered results will follow shortly... stay tuned.

-=[ Using Open Source Software ]=-
Blender 2.61: http://www.blender.org
Bullet Physics: http://www.bulletphysics.com
(btConvexHullComputer in LinearMath)
HACD: http://sourceforge.net/projects/hacd/