There is a new trailer out for Harry Potter and the Half Blood Prince, the film of book six. This Potter film was completed in time for Christmas, 2008, release but Warner decided to hold off on the release until summer, 2009, in hopes of a larger audience. Go here to see the new trailer.
It appears to me that they have done a bad job of casting Horace Slughorn, just as earlier films have done with Fleur Delacour and Dolores Umbrage. To my way of thinking the actress playing Dolores was too pretty and the young Frenchwoman playing Fleur not beautiful enough. Chris Colombus cast the main characters in films one and two and he did a brilliant job.