Great example of a traffic generating tool/content use to help market a product. The aplication allows visitors to view the popularity of names over time. The site provides a useful and interesting service for free and in turn get the oportunity to sell their product (a book on baby names – The Baby Name Wizard).
This is a great example of what the internet can do well – providing something of value to visitors and serving as a marketing vehicle for the organization. And by providing something interesting the site gets free publicity (such as this post).