It doesn't seem possible, but the scenarios just keep getting better. Now we get to effectively time travel to see where the Drow learned to aim meteors as weapons. A superlative effort. Check out my full review The Armageddon Echo
Mixing the Drow, Lovecraft, and the Gold Rush...Purely Awesome.
The second in the Second Darkness Adventure Path, this may be the first time your players actually come face to face with the Drow of Golarion. Check out my full review Children of the Void
In this epic story arc, the Dark Elves make their stamp upon the land of Golarion: With a Meteor. Get in at Ground Zero...Check out my full review of what may be my favorite Adventure Path Shadow in the Sky
Cities of Golarion detail six far flung cities like Whitethone and Ilizmagorti. They add richness and complexity to those kingdoms where they lie, and give players somewhere to be from. Check out my full review: Cities of Golarion
Golarion: A World with a Chewy Lovecraftian Center!
Once again, Golarion breaks from the pack. Detailing the lands below, a complex somewhat orderly ecology exists miles below the surface. Serpent Men and the Culture of Ghouls replace the Mindflayers as rivals for Drow dominance. A must have suppliment. Check my full review: Into the Darklands
Thirty Five Years Later, and It Still Gets My Creativity Flowing.
This is hands down the best tool a Dungeon Master could have. I have seen them all, and Paizo does it right...finally! Check out my full review Game Mastery Guide
This suppliment continues in Paizo's fine tradition of setting the bar. Extremely useful; no filler, packed with intrigue. Five Stars, maybe more. Check my full review A Guide to Korvosa
A clever idea that proves surprisingly useful. A must have to pull together a surprise ambush or a contact in a seedy bar. Check out my full review NPC Guide
This is one of the best rulebooks I have every encountered for clarity and ease of use, and versatility! Check out my full review: Advanced Player's Guide
I was absolutely amazed that this fantastic adventure was written by an amatuer. I would say he has a great career ahead of him. You really should check this out. Read my full review: Realm of the Fellnight Queen
Ease of Use, and Creative Prompts are the Order of the Day.
The Bestiary is the Monster Manual on steroids. Not only are the monsters deliniated in stats, but the flavor text sparks creative and fiendish ways to use them to abuse, erm, amuse your players. Check out my full review Pathfinder Bestiary
As Wizards of the Coast goes in pursuit of the World of Warcraft and Magic the Gathering crowd, Paizo Publishing continues the proud tradition of third edition, in fact, it could be called D&D Edition 3.75. Never has one volume contained so much, so well organized, and with so many really neat additions. Check out my full review Pathfinder Core Rule Book
Few Suppliments challenge a player to think of their characters motivations more than this one. Nationality, ethnic origin, race, all shape us, but what we choose to join, that defines us. This is a great piece of work.
One of the distinguishing factors seperating Golarion from all the other worlds is the importance of Hell as the nemesis of good. Demons this and Demon Queen of that are the order of the day in the Forgotten Realms. Now, see how just a little evil can go a very long way, exploring how a country that made a deal with the Devil fares.
This suppliment really does what I want a suppliment to do; it stimulates my creativity. This is how to make dragons scary again. The example of the white dragon alone shows how to make a monster that will be beyond memorable, and possibly, a TPK.
This guide gives a DM a lot of meat to work with; it is surprisingly well balanced in the forces at work in the Vale, and anything the players do will 1.) on the short term, have no lasting effect. But if they 2.) manage to eliminate any faction, the whole show will descend into Chaos. That's fun, right there.