Rowling 'heartbroken,' 'euphoric' at 'Potter's' end

How does J.K. Rowling feel now that she has finished the seventh and final Harry Potter book? As the author herself confided Tuesday on her Web site, "Charles Dickens put it better than I ever could":

"It would concern the reader little, perhaps, to know how sorrowfully the pen is laid down at the close of a two-years' imaginative task; or how an Author feels as if he were dismissing some portion of himself into the shadowy world, when a crowd of the creatures of his brain are going from him for ever," reads the passage from Dickens' preface to "David Copperfield."