Virgin.net recently conducted individual interviews with Robert Pattinson and Katie Leung, who respectively portray Cedric Diggory and Cho Chang in the Goblet of Fire. In each interview the two young actors discuss life before, during and after the Harry Potter film.
Here's a little tidbit of what each had to say about working with Harry himself, Daniel Radcliffe:
Robert Pattinson Interview: It's a very physical part, the stuff in the maze which was done in the beginning was all on huge action sets.... I got hit by stuff, getting pulled around by ropes, and Dan and I were running around punching each other so it was kind of vicious!
Katie Leung Interview: The scenes where [Dan]'s gazing at me from afar were really fun to film because you had to give him this look and tease him. I had to do a lot of looking back to make him think he's got a chance when really he hasn't because I have a boyfriend.
Click on each of the "Interview" links above to read the full article.