An interesting TED presentation on Google Labs 'NGram Viewer. The tools allows you to search for words and ideas in a google database of 5 million books.
If you were to put these 500 billion words into a computer, what can we learn?
For example: searching for the term "Zombies" in English Fiction the following chart is produced.
Take a look at the TED talk, there are all sorts of opportunities where you can use this tool. From making a piece of writing authentic, to identifying the source of a term.