Get all shipping methods

gistfile1.php

$methods = Mage::getSingleton('shipping/config')->getActiveCarriers();
$options = array();

foreach($methods as $_code => $_method)
{
    if (!$_title = Mage::getStoreConfig("carriers/$_code/title"))
        $_title = $_code;
    $options[] = array('value' => $_code, 'label' => $_title . " ($_code)");
}

var_dump($options);