<?php
$_product->getThisattribute();
$_product->getAttributeText('thisattribute');
$_product->getResource()->getAttribute('thisattribute')
         ->getFrontend()->getValue($_product);
$_product->getData('thisattribute');
// The following returns the option IDs for an 
//attribute that is a multiple-select field: 
$_product->getData('color'); // i.e. 456,499
// The following returns the attribute object, 
//and instance of Mage_Catalog_Model_Resource_Eav_Attribute: 
$_product->getResource()->getAttribute('color'); 
// instance of Mage_Catalog_Model_Resource_Eav_Attribute
// The following returns an array of 
//the text values for the attribute: 
$_product->getAttributeText('color'); 
// Array([0]=>'red', [1]=>'green')
// The following returns the text for the attribute
if ($attr = $_product->getResource()->getAttribute('color')):
    echo $attr->getFrontend()->getValue($_product); 

// will display: red, green
endif;
?>