Beijing's widest selection of English books (though spotty)

This is probably Beijing's best spot for English books. Now before you get too excited, recall that we are in Beijing and most of what people are looking for are ESL textbooks and Shakespearean classics. Nevertheless, this is a great place for browsing once every couple of months or so. They have a rather large collection of children's books on one of the upper floors and they have a smattering of contemporary novels and business books scattered throughout. Inexplicably the books are arranged into different little fifedoms by floor/room as if there's a different owner for each section, so if you don't find what you're looking for on one floor, you just might find it on another.