Like Mike, I enjoy new races. But mine have to be different somehow. I don't like elves, orcs, hobgoblins, dwarves, ogres and so on because they are so similar to humans. They can be replaced with human cultures quite easily. So here is my list by source.
Adventurer's Essentials: True Alchemy (Skortched Urf) [an excellent source of Pathfinder feats and races, not so much examples of alchemy]