The Google Zeitgeist page is regularly updated to reflect lists, graphs, and other tidbits of information related to Google user search behavior.
This might depress you, knowing the crap people search for. The top 10 Canadian queries for September are shown in this post.
If you use Google’s AdSense, creating posts based on the top searches may improve your revenue; but rest assured: I will never create a post that mentions Britney Spears, Angelina Jolie, Jennifer Lopez, or Usher. (Who or what the hell is a “Usher”? That’s rhetorial: I don’t want to know.) Never.