<?php
$custom_fields = get_post_custom($post->ID);
foreach ( $custom_fields as $field_key => $field_values ) {
	if(!isset($field_values[0])) continue;
	if(in_array($field_key,array("_edit_lock", "_edit_last", "_thumbnail_id"))) continue;
	echo "<strong>$field_key:</strong> $field_values[0] <br>";
}