Propnomicon owes it's existence to "Beyond the Mountains of Madness", the classic mega-adventure for Chaosium's "Call of Cthulhu" role-playing game that serves as a sequel of sorts to Lovecraft's "At the Mountains of Madness". Most of the early material posted here was done in support of that adventure, which rekindled both my fandom for Lovecraft and my love of propmaking. Click on the "At the Mountains of Madness" and "From the Mountains of Madness" labels over there on the right and you'll see just how much of an impact it had.
Beyond my own interests, BTMOM is arguably the best adventure ever created by the RPG industry. It's epic scale, historical detail, and numerous prop handouts combine to make it one of the most immersive scenarios ever published, and the final, chilling decision that confronts the party near the end of the story is the one time I've been genuinely emotionally involved by a tabletop game. Janyce Engan, the driving force behind the authors that created it, is now recounting the equally epic story of how it came to be over on Yog-Sothoth.com. Sadly, it's not a tale with a happy ending, but the look behind the scenes is fascinating.