I have a feature request, and I apologize if you've already heard this:
I borrow quite a lot of books from the public library. It would be great if D.L. could have a category to add books that you've read, but don't own.
I know I can add another bookshelf and call it "Library", but it would be a nice feature to be able to segregate my browsing by books that I own and books that I've read (or am planning to read?).
Just a thought.