Placing a hidden stat counter on a library web site or blog is a great way to see if visitor traffic justifies the time spent authoring the content. In addition to counting the number of new and returning visitors, these counters also give the author some insight into how people arrive at their page.
For example, a surprisingly large number of people reach A Librarian's Guide to Etiquette by doing one of the following Google searches: nude librarians, nude sexy librarians, and sexy librarians (presumably the latter still being clothed). The Guide's authors can only imagine that their accidental visitors are sorely disappointed to learn that librarians, by and large, are not the least bit sexy. And more often than not (thankfully), they do wear clothes.