Deformation Cleaner is a modifier for 3ds Max that smooths arbitrary deformations of a model without smoothing the original detail.
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.
3ds Max 2012 - Service Pack 1 Buglist
Ken Pimentel has posted a massive list of bugs that the upcoming Service Pack will fix for 3ds Max 2012.