Pathfinder goblins are my favorite goblins, so why did it take me so long to buy Pathfinder Companion: Goblins of Golarion?
The Basics: Like all of the other Player Companions, Goblins of Golarion is a full-color 32 page Pathfinder book. The retail price is 10.99. It tends to go for a much higher price if you order if you try to get it anywhere but Paizo's website. The book discusses goblin origins, physiology, and psychology. In addition it gives a list of goblin tribes (by region), discusses goblin religion (and includes gods and subdomains). We are also presented with campaign traits, favored classes bonuses, fighting feats, and magic.
The Good: The Pathfinder goblin creation story is cool. Lamashtu, mother of Monsters, stole for barghests from Asmodeus. The blood these beastly devil hounds shed created the first goblin. The traits are fun and can lead to some interesting characters. Also, I really like the Flotsam subdomain of water, which essentially lets you pull treasure from large bodies of water.
Also one of the regions discussed the Shackles... so goblin pirates!
The Bad: There really isn't anything bad about this book, other than the rarity of goblin pc's makes it a limited use book.
Final Thoughts: If you're like me and love Pathfinder goblins, pick this one up. It has a lot of nice rules and flavor.