http://67.15.36.49/team/Tutorials/ambient\_occlusion/ambient.asp
not exclusively related to vray but usefull for those who want to know more about occlusion in vray. 
Nice one Laurent!
Pretty images to look at too 
Lele
I use ambient occlusion for a lot of stuff including animation, 1 main problem is opacity, particularly with trees. I do hope the VRay version works like that but better.
you will have to wait and see galactus 