UPDATE: November 22. 2010
Boosted sound and trimmed some fat.
In part 1 of this tutorial I will show you one technique for modeling "spongy bone matrix", the cavernous mesh-like bone tissue found deep inside human bone.
Even if you aren't a medical animator, or have no interest at all in science visualization, I think you may learn a few things about metaballs and the mograph module. The mograph tools in cinema 4D are not only great animation tools, but useful modeling aids as well.
Part 2 will cover texturing, lighting and rendering.