Get URI from PodPress using PHP

$meta = get_post_meta(get_the_ID(), '_podPressMedia', true);
$meta = maybe_unserialize($meta);
if (is_array($meta) && count($meta) > 0)
    foreach($meta as $item){
        //do something...
    }

Please, do not use unserialize/serialize with php data stored structures there is native maybe_serialize/maybe_unserialize. Retriving single value from postmeta table also doesn’t require get_post_custom, all you need to do to use get_post_meta whish will return only required meta key data assinged to the post.