Remember, as Martin pointed out when talking about Avatar yesterday, just how much of The Dark Knight we'd been allowed to see before it actually hit the big screen? We're feeling a little bit that way about the upcoming Harry Potter And The Half Blood Prince.

Of course, the problem for Warner Bros was of its own making, when it delayed the release of the film by eight months, leaving a big gap in its marketing schedule. It's filled it with new trailers, spots and images, and as a result, has exposed more of the film than we'd generally expect of a big blockbuster.

Still, it continues to punt out the film, and another 30 second clip was shown on US TV the other night. And we've got it for you right here...