This plugin is basically a wrapper for the excellent dBug (http://dbug.ospinto.com) class for PHP debugging, written by Kwaku Otchere..
Instead of var_dump or echo, you can call wp_dbug( $variable ) to get clear, dynamic debug output of strings, arrays, or objects.
Thanks to @borkweb, the plugin is now compatible with the WP Debug Bar plugin (https://wordpress.org/extend/plugins/debug-bar/) for extra debugging goodness!