I have the Vino Italiano buying guide (pocket guide) by Joseph Bastianich and David Lynch. I found it very helpful when on vacation in Italy last year.
I was hoping there is something similar for French wines. I know my varietals of the major regions well enough but I am not that famiar with the producers. And I really would like to have more confidence about the smaller regions.
When out in a little village somewhere, I usually ask the waiter for a recommendation of a local wine and that can be exciting too.