Autodesk are showcasing their customers' best work in this post production and VFX showreel.
CGschool - Arch-Vis Training in 3ds Max, Photoshop and V-Ray
CGschool provides world-class architectural visualization training in 3ds Max, V-Ray and Photoshop.
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.