Modo Work Plane in 3ds Max
Changsoo Eun has released a collection of scripts that implement Modo's work plane in 3ds Max.
iToo Software have released version 2.2 of their RailClone plug-in for 3ds Max.
CG Cookie - Advanced Particle Manipulation in 3ds Max
CG Cookie have posted a tutorial that introduces us to advanced particle manipulation in 3ds Max.