This should be "What books have you read 100 times over".
I will read anything and everything containing words that gets close enough for me to see it. It used to be a running joke in my family that I'd even read the back of the cereal box at breakfast (and yes, I have). I love reading, and like Daxtomin, have read every genre available from sci-fi, fantasy, biographies, historical fiction, children's books, to most of the "classics". Case in point, a few years ago I read my way through the entire children's section at my local library. Yes, the ENTIRE section.
My mainstays are mostly late 19th and early 20th century children's books, and I have a stable of favorites I read over and over.....and over...and over. Most of them are the same ones I discovered for myself in first and second grade. And still love today. Most are now considered classics but to me they're normal. Some examples: A Little Princess, Black Beauty, Heidi, Jane Eyre, Little Women, The Secret Garden, all of the Little House books, Anne of Green Gables, and many more. I don't even know how many times I've read the Betsy-Tacy books or the Green Knowe series or the Edward Eager Magic books. Many of these I've purchased in Japanese and will be working my way through them soon. I still can't believe I found translations of Tom's Midnight Garden and Daddy Long Legs!
Lately I've been reading the classics. Wilkie Collins, George Gissing, of course Jane Austen, and Fanny Burney. And of course cookbooks. Don't know where I picked this odd habit up, but I enjoy reading cookbooks from the 1930s to the 1970s. Yes, reading. The ones from the 60s are hilarious, the ones from the late 70s are trippy, and the wartime ones are fascinating.