Yesterday evening Harry Potter author JK Rowling read from Harry Potter and the Half-Blood Prince at Edinburgh Castle to an audience of kids. The video shows Rowling arriving to screaming fans as she stops to sign some autographs, she also read an excerpt from a beginning chapter in the book. You can view some pictures here
You can watch the video of the Rowling reading here. You can also view a video of Jim Dale's apperance at Barnes & Noble Union Square in New York City.