Bringing the topic over from the EvilHack talk page: I questioned a few more people in IRC about it and they said that anything mentioned in the Guidebook shouldn't require spoiler tags. Good an idea though that is, I'm puzzled over just how far past that I should extend, especially considering there's an in-game lookup - "anything that would spoil the enjoyment of the game" is a pretty ambiguous boundary considering I heavily enjoy NetHack despite having been spoiled to hell and back before my first ascension earlier today.
So I'm soliciting input from anyone and everyone interested to figure out just how to handle it - as such, comments are appreciated.