Tutorial here... http://www.jamesshaw.co.nz/blog/?p=138
The above link is what we’ve (http://www.squintopera.com) have found works for rendering settings using vray in a quick tutorial/ list. There are many stories on various forums on what makes a difference, but I hope these settings will get people started and able to use vray for production output; which are primarily what these settings are for. However if you need more information as always visit the chaos forums. (http://www.chaosgroup.com/forums/vbulletin/).
There are 2 other key methods, adaptive and using pure brute force for animation passes which I’m hoping to put in another post… watch this space and I’ll put a link to it when I get 5mins off the work computer!
Tutorial here... http://www.jamesshaw.co.nz/blog/?p=138