It's Harry Potter's Page Cast - HPPC - #18. This podcast is an interview with non other than Robert Pattinson. Rob portrays Cedric Diggory in the Harry Potter films and Edward Cullen in Twilight, which will be in theatres on November 21st!
This interview was done by many different Twilight and Harry Potter fans sites. In it he answers many questions, including why he auditioned for Twilight, how Midnight Sun influenced his portrayal of Edward, about some of the difficult stunts he had to do, and much more!
You can listen to the podcast online on HPPC (it's number 18), or you can download it here.
Credits to: HPPC and Edward Cullen Source.