Alright, I can give you a better example. Netflix uses S3 to store movies that haven't been rendered yet. It's definitely a database. The server says "I need to render this movie to the iPhone format, what are the movie bits" and the "database" (S3) returns the entire movie.

Also, I would argue that static content delivery is just another form of database. It's just a massive key/value store, there the keys are the files and the values are the contents of the keys.

Let me ask you this: What is your definition of a database?