I use it in form of a meta box. Here is a function that dumps values of all the meta data for post.
function dump_all_meta(){
echo "<h3>All Post Meta</h3>";
// Get all the data.
$getPostCustom=get_post_custom();
foreach( $getPostCustom as $name=>$value ) {
echo "<strong>".$name."</strong>"." => ";
foreach($getPostCustom as $name=>$value) {
echo "<strong>".$name."</strong>"." => ";
foreach($value as $nameAr=>$valueAr) {
echo "<br /> ";
echo $nameAr." => ";
echo var_dump($valueAr);
}
echo "<br /><br />";
}
} // Callback funtion ended.
Hope it helps. You can use it inside a meta box or at the front-end.