This code will show you how to get the product id of the last product that was added to the shopping cart, and all the products currently in the shopping cart.

$productID=Mage::getSingleton('checkout/session')->getLastAddedProductId(true);

echo $productID."<br>";

$_product=Mage::getModel('catalog/product')->load($productID);

echo $_product->getName()."<br>";

$session= Mage::getSingleton('checkout/session');

foreach($session->getQuote()->getAllItems() as $item)

{

    $productID = $item->getProductId();

    $productSku = $item->getSku();

    $productName = $item->getName();

    $productQty = $item->getQty();

    echo $productID."|".$productSku."|".$productName."|".$productQty."<br>";

}