I was just talking to another mom about reading lists for summertime. This book, Invitation to the Classics, is a fun and beautiful read. It has brief synopsises (synopses?) of "the books you've always wanted to read," including Plato, Aristotle, Chaucer, Dante, Thomas More, Thomas Aquinas, Jane Austen, Mark Twain, T.S. Eliot.... they're all there! You don't even have to read the originals! (That's a half-joke.)
It's a good investment for anyone who plans to homeschool her children, as well.