One of the sites I read regularly is Bookgasm—a blog dedicated to genre fiction, cheap magazines, and trashy paperbacks—because there's a special place in my heart reserved for all things tacky. They do a feature called "Search Me" which reveals that most of their search engine traffic comes from pervs looking for naked pictures of the starlet of the moment. Or Charo.
BookBlog's most popular search strings are boring by comparison. For example, here are our top ten keyphrases for June:

This month, though, has brought us a whole lot of traffic from Harry Potter searches thanks to the release of book 7. In taking a browse through the stats this morning, I have discovered that BookBlog is the first Google result for...drumroll...wait for it...here it comes...
It's, oh, so pleasing to be number one. Thanks, Google!