// Add extra field to comment form
function add_bcw_fields(){
   echo '<input type="text" name="test" id="test" size="22" />';
}
add_action( 'comment_form_logged_in_after', 'add_bcw_fields' );

//Save the extra comment field value
function bcw_handle_comment($id) {
   if (array_key_exists('test', $_POST))
      update_comment_meta( $id, 'bcw_test', $_POST['test']);
}
add_action('wp_insert_comment', 'bcw_handle_comment');
//Override default theme function to display a comment

function twentyten_comment( $comment, $args, $depth ) {
	$GLOBALS['comment'] = $comment;
	switch ( $comment->comment_type ) :
		case '' :
	?>
	<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
		<div id="comment-<?php comment_ID(); ?>">

			<div class="comment-author vcard">
				<?php echo get_avatar( $comment, 40 ); ?>
				<?php printf( __( '%s <span class="says">says:</span>', 'twentyten' ), sprintf( '<cite class="fn">%s</cite>', get_comment_author_link() ) ); ?>
			</div><!-- .comment-author .vcard -->
			<?php if ( $comment->comment_approved == '0' ) : ?>
				<em class="comment-awaiting-moderation"><?php _e( 'Your comment is awaiting moderation.', 'twentyten' ); ?></em>
				<br />
			<?php endif; ?>

			<div class="comment-meta commentmetadata"><a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>">
				<?php
					/* translators: 1: date, 2: time */
					printf( __( '%1$s at %2$s', 'twentyten' ), get_comment_date(), get_comment_time() ); ?></a><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' );
				?>
			</div><!-- .comment-meta .commentmetadata -->
                        <?php echo get_comment_meta( $comment->comment_ID, 'bcw_test', true ); ?>
                        <div class="comment-body"><?php comment_text(); ?></div>
			

			<div class="reply">
				<?php /* <?php comment_reply_link( array_merge( $args, array( 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?> */ ?>
			</div><!-- .reply -->
		</div><!-- #comment-##  -->

	<?php
			break;
		case 'pingback'  :
		case 'trackback' :
	?>
	<li class="post pingback">
		<p><?php _e( 'Pingback:', 'twentyten' ); ?> <?php comment_author_link(); ?><?php edit_comment_link( __( '(Edit)', 'twentyten' ), ' ' ); ?></p>
	<?php
			break;
	endswitch;
}
endif;