A company like Netflix but for books: Paperspine
. Decide what kind of plan you want (certain number of books at a time, per month), and choose from 150,000 titles. Very good idea for those books you SECRETLY want to read, but wouldn't be caught dead actually owning or borrowing from the library, like Skinny Bitch in the Kitch (a cookbook) and The Yoga Facelift.
List includes numerous thrillers, romances, self-helps. In the poetry category you can get Gilgamesh, Beowulf (Seamus Heaney translation), The Odyssey, and Howl, among others. Have a browse! Plans start at $9.95 a month. Currently in beta.