1,建立文件app/code/core/Mage/Catalog/Block/Product/Special.php

class Mage_Catalog_Block_Product_Special extends Mage_Catalog_Block_Product_Abstract
{
protected $_productsCount = null;

const DEFAULT_PRODUCTS_COUNT = 6;//默认显示数量

protected function _beforeToHtml()
{
$todayDate = Mage::app()->getLocale()->date()->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);

$collection = Mage::getResourceModel('catalog/product_collection');
Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($collection);
Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($collection);

$collection = $this->_addProductAttributesAndPrices($collection)
->addStoreFilter()
->addAttributeToFilter('special_from_date', array('date' => true, 'to' => $todayDate))
->addAttributeToFilter('special_to_date', array('or'=> array(
0 => array('date' => true, 'from' => $todayDate),
1 => array('is' => new Zend_Db_Expr('null')))
), 'left')
->addAttributeToSort('special_from_date', 'desc')
->setPageSize($this->getProductsCount())
->setCurPage(1);
$this->setProductCollection($collection);

return parent::_beforeToHtml();
}

public function setProductsCount($count)
{
$this->_productsCount = $count;
return $this;
}

public function getProductsCount()
{
if (null === $this->_productsCount) {
$this->_productsCount = self::DEFAULT_PRODUCTS_COUNT;
}
return $this->_productsCount;
}
}

3,后台CMS->Page->Home page->Content中添加{{block type=”catalog/product_special” template=”catalog/product/special.phtml”}}

ps：如想在其他页面显示，直接建个Page复制代码{{block type=”catalog/product_special” template=”catalog/product/special.phtml”}}至Content即可。

今下午试了一下，还不错呢~~~