Here is a tutorial on using Motiva COLIMO 1.7, a realtime postproduction tool with native Vray 2.4 support.
Motiva Exposure Control for V-Ray
Motiva have released a free plugin for 3ds Max that serves as an extension over V-Ray's native Exposure Control.
CGCookie - Advanced Car Rendering in VRay
CGCookie have released a tutorial series on advanced car rendering in VRay, with compositing in Fusion.