Small books, big ideas!

What are you reading this summer?  I just finished 'The Once and Future King,' and must now classify where it fits in my pantheon of favorite books.  It is one of those stories you can't just read once, indeed, you must peruse it again and again to even begin to understand it.  I guess it goes on the shelf next to 'The Man Who Was Thursday' and 'That Hideous Strength.'  Both books I'm still trying to wrap my mind around what they are trying to say.  Reading such books is a great way to keep your brain from getting rusty, but I'm not sure mine is ready for gymnastics quite yet.