I saw a really cool thing on ProBlogDesign. In the comments there is also the amount of comments the comment authors made. Here is a screenshost.

Here is a function you can use to get and echo the number of comments a comment author made. Put it in the functions.php file in your theme.

function commentCountAuthor(){

	$oneText = 'One comment';
	$moreText = '% comments';

	global $wpdb;

	$result = $wpdb->get_var('
		SELECT
			COUNT(comment_ID)
		FROM
			'.$wpdb->comments.'
		WHERE
			comment_author_email = "'.get_comment_author_email().'"'
	);

	if($result == 1): 

		echo str_replace('%', $result, $oneText);

	elseif($result > 1): 

		echo str_replace('%', $result, $moreText);

	endif;

}

Simply call the functions inside the comments loop.

commentCountAuthor();

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