Demolition Master is a 3ds Max tool based on Thinknig Particles for the creation of all kinds of destruction.
Portal Trick Shots - VFX Breakdown
Corridor Digital talk about how they created their recent Portal Trick Shots short film.
3ds Max Particle Flow Tutorial - Barn Tornado
Pete Draper has made an 11-part tutorial on creating a tornado using Particle Flow in 3ds Max.