Was surfing The Tube, and watching interviews of cast members of House.
Then I came across this channel ; The Paley Center for Media, which has tons of on stage interviews with TV related shows and the directors, script writers, producers and actors, discussing about the process and behind the scenes, what goes into the writing scripts, character build up, acting choices and how it's delivered.
Below are just some of the stuff available for your viewing pleasure.
Prison Break - Robert Knepper on T-Bag
House - Hugh Laurie & Jesse Spencer on Inflections