This plugin adds tracking code for Google Analytics to your WordPress "head" section, so you can authorize your site in Google Webmaster Too
Register at http://www.google.com/analytics/, add your site and then Google will provide you valid Google Analytics code (something like UA-xxxxxxxx-y)
It is for Google Webmaster Tools users. You can prove that your site is owned by you using Google code. However, in that case, Google will require that the code was placed in the "head" section of the site.
Yes, it is under GPLv2 licence. However, you can donate me a few dollars if it makes you feel good. I certainly have nothing against it.