The online security script WordPress Scanner is a great tool which can be used to scan your WordPress blog for several vulnerabilities such as outdated versions of WordPress or single files and XSS vulnerabilities in themes. All you need to do is add the line in the header of your blog so that the WordPress Scanner cgi script can access the information and knows that you are indeed the owner of the blog.

This tool is not perfect but it analyzes the versions of your WordPress files which is probably the dominant attack vector when it comes to WordPress hacking and basic XSS vulnerabilities in the themes. The tool gives advice if vulnerabilities have been found on how to fix them.

Just make sure you run the script, follow the guidelines and remove the wpscanner entry from your header again. You would not want someone else to be able to check your blog for vulnerabilities, would not you ? This is a great little script which should become even better when the author adds checks for plugins.