Custom callback for HTML5 friendly WordPress comment. Also includes schema.org microdata. To use, insert the following into comments.php: <?php wp_list_comments('callback=better_comment&end-callback=better_comment_close'); ?>

wp-comment-callback

	// awesome semantic comment

	function better_comment($comment, $args, $depth) {
		$GLOBALS['comment'] = $comment;
		extract($args, EXTR_SKIP);
		
		if ( 'article' == $args['style'] ) {
			$tag = 'article';
			$add_below = 'comment';
		} else {
			$tag = 'article';
			$add_below = 'comment';
		}

		?>
		<<?php echo $tag ?> <?php comment_class(empty( $args['has_children'] ) ? '' :'parent') ?> id="comment-<?php comment_ID() ?>" itemscope itemtype="http://schema.org/Comment">
			<figure class="gravatar"><?php echo get_avatar( $comment, 65, 'http://hey.georgie.nu/wp-content/themes/heygeorgie/images/bg.png', 'Author’s gravatar' ); ?></figure>
			<div class="comment-meta post-meta" role="complementary">
				<h2 class="comment-author">
					<a class="comment-author-link" href="<?php comment_author_url(); ?>" itemprop="author"><?php comment_author(); ?></a>
				</h2>
				<time class="comment-meta-item" datetime="<?php comment_date('Y-m-d') ?>T<?php comment_time('H:iP') ?>" itemprop="datePublished"><?php comment_date('jS F Y') ?>, <a href="#comment-<?php comment_ID() ?>" itemprop="url"><?php comment_time() ?></a></time>
				<?php edit_comment_link('<p class="comment-meta-item">Edit this comment</p>','',''); ?>
				<?php if ($comment->comment_approved == '0') : ?>
				<p class="comment-meta-item">Your comment is awaiting moderation.</p>
				<?php endif; ?>
			</div>
			<div class="comment-content post-content" itemprop="text">
				<?php comment_text() ?>
				<div class="comment-reply">
					<?php comment_reply_link(array_merge( $args, array('add_below' => $add_below, 'depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
				</div>
			</div>
		<?php }

	// end of awesome semantic comment

	function better_comment_close() {
		echo '</article>';
	}

any idea how I would go about abstracting this to a separate class, which I would then include with an autoloader.