On my shelf I have a few of the main Pathfinder books from Paizo and a fair number of Frog God Games books. Ironically despite Frog God being fewer books on my shelf, they take up much more shelf space!
[Slumbering Tsar, Rappan Athuk, Tome of Horrors] That's like half a shelf right there. Sitting nearby Ptolus. I like thick books for some reason.
I buy a lot of third party Pathfinder Stuff, but for OGL games and their descendants, that's about the extent of third party stuff I buy. Frankly, pretty much everything else I buy is Indie stuff or FFG 40K stuff.
There's approved 3rd-party content? As a 3rd party publisher of (what I consider extrememly good) Pathfinder stuff, it's embarrassing that I don't know this. Where would I find out what content is approved?