Pete Draper has made an 11-part tutorial on creating a tornado using Particle Flow in 3ds Max.
Xoliul Shader II
Laurens Corijn and Robbert-Jan Brems have released Xoliul Shader II, a free viewport plugin for 3ds Max.
All About Spline: Working With Sub-Objects
Check out a tutorial called All About Spline: Working with Sub-objects for 3ds Max, by DTuts.
e-on software have launched Ozone 5.0, an atmospheric plugin for 3ds Max, Maya, Softimage, Cinema4D, and LightWave.