I've got books on crafting plots and on crafting crafts, cookbooks for both modern and historic kitchens, name reference books, books on states' wildlife, and even several antique novels and biographies for inspiration.
I was reading a blog post by Kristin Billerbeck (Girls Write Out) about not liking libraries that much, and I can certainly relate. If I find a book of value, I want to own the book and have it available whenever I want it. I want to be able to highlight and flag the book to meet my needs. So. . .I have too many books.
My home library issue has led me to ask what tools of research you use? How are you making sure you have enough resources to verify the facts you want to use in your stories? Are all writers' homes doomed to be overflowing with books? I'd be interested to hear your responses. Tell me what books I can part with.
(another 3 pounds lighter)