MSN UK launched a competition for British fans to win a trip to Chicago to visit Harry Potter: The Exhibition at the Museum of Science and Industry, in Illinois. To enter, enter your details and answer this question at the previous link;

In the movie HARRY POTTER AND THE HALF-BLOOD PRINCE, what is the name of the Defense Against the Dark Arts professor at Hogwarts?

Professor Slughorn
Professor Snape
Professor Moody
Professor Dolores Umbridge

The competition is open to UK residents 12 and older. The grand prize is a three night trip for two people, with an exclusive tour of the exhibit. You must be available to travel between September 25th and September 29th 2009. The competition closes on August 20th.

Thanks SS!