In the latest version of WordPress the comment styling shortcode method used in this plugin doesn't work.
They do have a newer version, but for some reason it wasn't submitted to the repo:
http://www.tipsandtricks-hq.com/wordpress-plugin-for-simple-google-adsense-insertion-170
http://wordpress.org/extend/plugins/wordpress-plugin-for-simple-google-adsense-insertion/
