I wanted to leave a brief recommendation for a movie, I caught it on Amazon Instant Video but it's also available on DVD.
The film is "I Know That Voice!", and it's a great documentary featuring dozens of "voice actors." You may not recognize their names, but you will recognize their voices, most of which are known by their cartoons. Parts are quite funny, but it's mostly a behind-the-scenes look at some very talented professionals and what they do. I enjoyed it immensely and I think you will, too.
Amazon has the DVD available for Pre-Order: