Chaos Group have posted the official V-Ray feature film showreel for 2013.
V-Ray Demo Reels 2012
Here are all the demo-reels released by Chaos Group for V-Ray, in multiple categories.
Take a look at these feature videos for Chaos Group's fluid dynamics plug-in, Phoenix FD.
Realistic Grass in 3ds Max with V-Ray - Tutorial
Michal Horba from Evermotion explains how to create grass using the V-ray displace modifier in 3ds Max.