http://cg.tutsplus.com/tutorials/blender/construct-a-microcosm-using-blender-2-5-modeling-rigging/

In the first part of this brand-new, advanced Blender 2.5 tutorial, Frederik Steinmetz walks us through how he modeled and rigged his ‘Microcosm’ creation! The full tutorial will go on to discuss complex particle & hair simulation, how to add materials, texture and light the scene, and finally how to use nodes for depth of field, so let’s get started!