Class 8

function factorian_post_list( $atts, $content = null ){

	extract(shortcode_atts(array(
		'posttype' => '',
		'count' => '',

	), $atts));

	$q = new WP_Query(array(
		'post_type' => array($posttype),
		'posts_per_page' => $count,
		'order' => '',
		'orderby' => '',
	));

	$list = '<div class="custom_post_list"> ';

		while($q->have_posts()) : $q->the_post();
			$idd = get_the_ID;
			$custom_field = get_post_meta($idd, 'custom_field', true);
			$post_content = get_the_content();

			$list .= '<ul>';
			$list .= '<li><a href="'.get_permalink().'">'.get_the_title().'</a></li>';
			$list .= '</ul>';

		endwhile;

	$list .= '</div>';

	return $list;
}
add_shortcode('post_list', 'factorian_post_list');