Hi. Unless you are looking for a book that deals with the standalone version - I 'm just learning about it. Brian Smith authored a book and is coming out at the end of July:
3ds Max 2009
Architectural Visualization
Intermediate to Advanced
for more information, checkout this link:
http://www.3dats.com/products.asp
I'm guessing it also covers Mental Ray 3.6 since Mental Ray it is an integral part of 3DS Max.
Perhaps we should ask Brian Smith. I'm getting one for myself

soon.