As I have said many times before, having more options for your RPG games is never a bad thing (unless you get into analysis paralysis, which is your own issue to deal with). The fellows over at The Four Horsemen and Rogue Genius Games agree with me. As such, they have teamed up to bring you The Genius Guide to the Talented Bestiary, designed for use with Pathfinder.
In short, the book is a set of rules for creating balanced creatures for your game. It's perfect for any special campaign settings or specific enemies you want to have in your game, but there aren't any rules for them yet. Of course, you want examples of what the rules can create, so the guys have made over 200 as part of the book.