A friend who lives Way Over There, on the left-hand coast, tells me she's rearranging her library into areas based on mood: The Cheer-Up Section (Grimm's Fairy Tales, Anna Karenina), The Survival Section (How to Stay Alive in the Woods, The Little Black Book of Cocktails), etc.
My books tend to be roughly grouped by project or area of interest: dissertation books nearest to the desk, teaching books, novels, memoirs & bios, etc. (Well, Foucault does get his very own half-shelf, though for humor's sake I put my small-but-growing collection of old medical and sex advice manuals next to him. I thought he'd enjoy that.)
Bedtime reading in and around the bed includes erotica and Buddhist stuff. I wonder if they'll merge some night, so that suddenly those short erotic tales will be of mindful lesbians negotiating nonattached liasions that might help them to mutually glimpse the divine...
So, how are you organizing your books? Or, better yet, if you had the time and inclination, how would you want to organize your books?
(I'm reminded of Ellen DeGeneres's tour a few years back, when she talks about having arranged her CDs by food group...Meat Loaf, Red Hot Chili Peppers, The Cranberries...)