Thom Hogan has been working on an eBook, updated version of his Nikon Flash Guide for a few years now. That sounds like it will do the trick, when/if he ever gets it finished.
I emailed Thom a few days ago and here is what he said about his progress on the Flash Guide:
"Well, I completed it once, but I didn't like it, so I'm rethinking how
I want to do this. My new thinking is that there will be at least two
things necessary to replace NFG."
That unfortunately means it's gonna be some time before we see a new Nikon Flash Guide that covers CLS. He has no ETA.
I'm not aware of anyone else that is working on such a project, so I've been bugging Thom regularly (every few months) about when we'll see the NFG.
Just thought I would pass this on.