See the improvement offered by the new Voronoi modifier, versus the old Fragmenter, in the new update for RayFire.
Splice for 3ds Max
Fabric Software has posted a video of the upcoming Splice plug-in for 3ds Max.
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.