Pete Draper has made an 11-part tutorial on creating a tornado using Particle Flow in 3ds Max.
Create Rocket Plume Using 3ds Max Particle Flow - Tutorial
Pete Draper has a video tutorial on how to create rocket plume using Particle Flow in 3ds Max.
RayFire Voronoi vs RayFire Fragmenter
See the improvement offered by the new Voronoi modifier, versus the old Fragmenter, in the new update for RayFire.
3ds Max 2012 - Hotfix 1
Good news! Autodesk have released the first Hotfix for 3ds Max 2012, fixing several issues and bugs.