Canadian website Dose.ca has released the full-length clip of Dumbledore's memory of young Tom Riddle from Half-Blood Prince; this is the extended version of what was shown during the MTV Movie awards last month. It can be viewed below:



Additionally, the website shows a nine-minute clip of the first five movies, including never-before-seen scenes from the earlier films, which can be watched here (it is entitled Harry Potter Exclusive - A Retrospective).

Thanks to Sam for the tip!