magento get all available shipping methods

function getAllAvailableShippingMethod()
{
$methods = Mage::getSingleton('shipping/config')->getActiveCarriers();
$shipMethods = array();
foreach ($methods as $shippigCode=>$shippingModel)
{
    $shippingTitle = Mage::getStoreConfig('carriers/'.$shippigCode.'/title');
    $shipMethods[$shippigCode] = $shippingTitle;
}
return $shipMethods;
}