Pete Draper has made an 11-part tutorial on creating a tornado using Particle Flow in 3ds Max.
Snappers Facial Rig
Check out the Snappers Facial Rig for Maya, (also available for 3ds Max), featuring incredible detail and controls.
Map Transfer is a free 3ds Max and Thinknig Particles tool that converts color information into a transformation.
SciFi Pattern Generator
SciFi Pattern Generator for 3ds Max lets you generate complex 3D models with a single click.