BBQ Bible is good, very world oriented. BBQ USA, I have to say, bored me, because it was equally as much space dedicated to minor variations in one single country's live fire cooking. I also have his Ribs book and Beer Can Chicken book, and I really like the ribs book, as it launched me on a number of foreign adaptations of the typical rib recipes, but the Beer Can Chicken book is more, well, the recipes are the same, basically, similar sauces and all, and once you dispense with the false magic of the beer can (non boiling liquid in the chicken cavity) a lot of the gimmick is gone.
But Planet Barbeque looks like it takes up where BBQ Bible left off, lots of very varied world cuisines represented. The guy has a pretty sweet gig, travelling the world and sampling the best of the world's grillmasters produce.