Gives you full control over comment structure and output.

snippet.php

/*
 * Custom Comments
 * Description: Use custom comments (overrides wp_list_comments like so: <?php wp_list_comments('type=comment&callback=mytheme_comment'); ?>)
*/
function mytheme_comment($comment, $args, $depth) {
    $GLOBALS['comment'] = $comment;
    extract($args, EXTR_SKIP);
    if ('div' == $args['style']) {
        $tag = 'div';
        $add_below = 'comment';
    } else {
        $tag = 'li';
        $add_below = 'div-comment';
    } ?>

    <<?php echo $tag ?> <?php comment_class(empty($args['has_children']) ? '' : 'parent') ?> id="comment-<?php comment_ID() ?>">

    <?php if ('div' != $args['style']) : ?>
        <div id="div-comment-<?php comment_ID() ?>" class="comment__body">
    <?php endif; ?>

            <div class="comment__meta">
                <div class="comment__author vcard">
                    <?php if ($args['avatar_size'] != 0) echo get_avatar($comment, $args['avatar_size']); ?>
                    <?php printf(__('<cite class="fn">%s</cite> <span class="commented">commented:</span>'), get_comment_author_link()) ?>
                </div>

                <?php if ($comment->comment_approved == '0') : ?>
                    <em class="comment-awaiting-moderation"><?php _e('Your comment is awaiting moderation.') ?></em>
                <?php endif; ?>

                <div class="comment__date commentmetadata">
                    <?php printf(__('%1$s at %2$s'), get_comment_date(),  get_comment_time()) ?>
                    <?php edit_comment_link(__('(Edit)'),'  ',''); ?>
                </div>
            </div>

            <?php comment_text() ?>

            <div class="reply">
                <?php comment_reply_link(array_merge($args, array('add_below' => $add_below, 'depth' => $depth, 'max_depth' => $args['max_depth']))) ?>
            </div>

    <?php if ('div' != $args['style']) : ?>
        </div>
    <?php endif; ?>
    <?php
}