|I use a subjective version of the dewey decimal system - without the stickers on the books. |
Kids books together, sci-fi/fantasy together, religion together, where it verges on occult, which merges with travel books and travelogues and the occasional picaresque novel (there's a personal, metaphysical reason for that). "Think books" (philosophy, theory, old textbooks) together, near poetry. Cook books together, near reference books and home improvement/interior decor books.
There are also a couple author collections, where I've got a bunch of books by the same person. Vonnegut, Lovecraft, Robbins, Dahl, Wilson.
Pop culture books together (books about the Beatles, Elvis, Billy Jack, tv shows, Broadway). (Although "Are You Hungry Tonight?" is with the cookbooks.) "Classics" are also together, for the most part, and vaguely chronological (Dickens and George Eliot share a shelf, the Iliad, Le Morte D'Arthur and Don Quixote share another shelf).
There are too many books. Far too many.