Do The Interview! Framestore and their work on HP5! (VFXTalk)
http://www.vfxtalk.com/forum/showthread.php?t=11535
Harry Potter: Muggles make Magic. - Building the scenes and characters to continue the Hogwarts legend. (CGSociety)
http://features.cgsociety.org/story.php?story_id=4225
Paul Franklin VFx Supervisor Double Negative (CG Channel)
http://www.cgchannel.com/news/shownews.jsp?newsID=6433
Harry Potter: The Magic of Double Negative (fxguide)
http://www.fxguide.com/article444.html
Order of the Phoenix: Escalating Potter VFX -- Part 1 (VFXWorld)
http://www.vfxworld.com/index.php?atype=articles&id=3362
Order of the Phoenix: Escalating Potter VFX -- Part 2 (VFXWorld)
http://www.vfxworld.com/?atype=articles&id=3363