First by book style*, then genre, then alphabetically by author's name, then grouped by series if necessary and then alphabetical by title or series title.
*Book style meaning general size of the book. All the mass market paperbacks go together for both shelf efficiency as well as aesthetic purposes, even if I also have hardbacks by some of those same authors. Likewise, trade paperbacks are kept separately, and as we don't actually have very many of them, they are mostly organized by height for aesthetic purposes rather than alphabetically.
Also, we stack the mass market paperbacks two high on the shelves, because we have so damn many of them.
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