People who click on your ads are people comming from search engines, not regular readers. In order to decrease the chance of being “smart priced” by Google Adsense, you should definitely show ads to search engines visitors only. Here’s how to do it.
By default,WordPress comes with a version of jQuery built in, but using that version jQuery means that new visitors to your site will take long time to load the file when they first visit your page. In fact,a number of users have already downloaded a version of jQuery via Google’s hosted version, so you can take advantage of Google AJAX Libraries content delivery network to serve jQuery to your users directly from Google’s network of datacenters.
Google trends is a service which track the popularity of specific keywords. There is a WordPress shortcode that will embed a Google trends graph of any comma separated query you enter to display a trend over time on your blog.