Show SKU below product title if it is not showing already
reference:
http://www.expertwebadvisor.com/display-sku-on-the-product-listing-page-and-the-product-description-page-in-magento/
on /template/catalog/product/view.phtml
look for the title tags:
<div class="product-name">
<h1><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></h1>
</div>
and just below that or a place you choose , put:
<?php echo nl2br($_product->getSku()) ?>