As a side note a lot of Wordpress sites do expose the wp-config-sample.php file. See for example the official Yahoo! Blog, The Wall Street Journal, Sony Blog, etc...:

http://ycorpblog.com/wp-config-sample.php

http://blogs.wsj.com/law/wp-config-sample.php

http://blog.us.playstation.com/wp-config-sample.php

...