The New York Times has a wonderful example of rich prospect browsing in The State of the Union in Words: A Look at the 34,000 State of the Union Words Delivered of George W. Bush. They show the different State of the Union addresses with the pattern searched for in red on the left. On the right they show frequency bubbles for key words including the one you search for. Rich prospect browsing is an idea I learned about from Stan Ruecker – see the Humanities Visualization projects he is involved in.
Thanks to Daniel for showing this to me.