Originally released for Free RPG Day 2009.
From the back of the book:
Unleash the Beasts!
Get your first look at the upcoming Pathfinder Roleplaying Game and the Pathfinder Bestiary right here, with more than a dozen menacing monsters. Showcasing the new rules and flexibility of the Pathfinder Roleplaying Game, this collection of creatures draws from more than 30 years of gaming history and includes:
* Deadly beasts and familiar allies, such as allips, caryatid columns, faerie dragons, huecuvas, shadow mastiffs, and more!
* New rules for monstrous companions, arcane creations, sinister traps, variant creatures, and other options for use with both 3.5 and the Pathfinder Roleplaying Game
* Explanations of never-before-seen rules being included in the Pathfinder Roleplaying Game
* A preview listing of nearly every monster to be included in the upcoming Pathfinder Bestiary
* Reimaginings of some of the most iconic creatures in gaming, vibrantly illustrated by some of the best artists in fantasy