Dragonlance: This is almost unintentional, but when I was a tween and young teen, i devoured everything Dragonlance and internalized much of its themes and imagery...
What is your personal Appendix N?
I like this topic (and I missed it originally)! Some awesome ideas above!
2nd Edition D&D:
I'm in complete agreement on Dragonlance. It's influence on my personal visualization of "High Fantasy" is indelible. Especially the original "Dragonlance Adventures" hardcover, "Time of the Dragon" and "Taladas the Minotaurs," and anything by Knaak.
Which makes this "My" Appendix N, what has shaped my playing/perception (through this week), and not necessarily what I'd suggest to other players (but I'd still suggest all of this; the other list is just LONGER).
Dark Sun and Planescape.
The Pathefinder 1E starter set
And in no particular order (both Fantasy and Sci-Fi):
Books:
Bullfinch's Mythology
The Greek, Egyptian, and Norse mythology books in my elementary school library (the names all escape me now)
Barlowe's Guide to Extraterrestrials
The Terran Trade Authority series
Leiber's Ffahrd and The Grey Mouser series
Dark Horse's Conan Comic Adaptations
Ben Aaronovich's Rivers of London series (a recent addition)
Shakespeare's The Tempest and Midsummer Night's Dream
And like so many of us: Lord of the Rings, Chronicles of Narnia, and the related films.
Films/TV
Star Wars (IV-VI, Caravan of Courage and Battle for Endor)
WILLOW!!!!!
Krull
Labyrinth
Neverending Story
The Hobbit (Rankin Bass)
Sleeping Beauty (Disney)
Heavy Metal (the cartoon movie)
Masters of the Universe (and probable She-Ra, Thundercats, Herculoids, Thundarr, etc.)
The Princess Bride
Monty Python and the Holy Grail
Video Games:
GAUNTLET!
Castlevania I and II
Dragon Warrior I, II, and III
The Legend of Zelda and Link's Adventure
Final Fantasy I and II (NES)
Art
Elmore, Easley, Caldwell, and most of all, Keith Parkinson
Tomy DiTerlizzi
Brian Froud
Wayne Reynolds
LEGO Castle sets!
And, a special note to Magic the Gathering: The Dark, Homelands, and Visions (yes. Those three sets in particular.)