While I believe the number of "raw" recipes is far less than 500 (maybe I'm wrong), after each section they offer 4-6 "variations" on each of the recipes previously given. Between all the variations on the primary recipes, there's probably about the 500 number.
For anyone expecting a large book, well, large it's not. It's probably about 6" square but a tiny bit over an inch thick. For being so small, it packs a lot of recipes and a fair amount of other info into its tiny shelf footprint.
I think it's a very worthy supplement to Flatbreads & Flavors (a good survey of flatbread culture the world over) and Vegetarian Pizza Cookbook (I mention it mainly for its good variety of crusts and a few nifty dessert pizza recipes).
This seems like a pretty decent little compendium and certainly could be used to spur some creative pizza & flatbread dishes... Though, I might have liked to see a wider variety of crusts & sauces introduced. Or, as with Flatbreads & Flavors, some other recipes thaVegetarian Pizzat would act as accompaniments to the pizzas & flatbreads listed. Such as some curries or other things that typically go with the mentioned breads. But, I guess that's why I think this book and Flatbreads and Flavors complement one another relatively well.