Because the Blu-Ray movies are Hi-Def, when you have a 16x9 screen (I have a 42" plasma), does the actual player and movie fill the whole screen, like HD channels?
I wasn't sure if Blu-Ray movies came in widescreen and if they did, if you still get the letterbox.
The answer depends on the original aspect ratio of the film. Whatever it was when shot on film is what you get. Some movies will fill the screen, others won't. Google "original aspect ratio film" to learn more.