Magento Create Limited & Random Product List.

In my case i have create featured product list with product 10 and it display randomaly.
Please copy past following code in your collection block file.

protected function _getProductCollection()
{
        if (is_null($this->_productCollection)) {
            $collection = Mage::getModel('catalog/product')->getCollection();
            $collection
            ->addAttributeToSelect(Mage::getSingleton('catalog/config')->getProductAttributes())
            ->addMinimalPrice()
            ->addFinalPrice()
                    ->addAttributeToFilter('featured_product', 1)
            ->addTaxPercents();
            $collection->getSelect()->order(new Zend_Db_Expr('RAND()'));
            $collection->setPage(1, 10)->load();

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

        }
        return $this->_productCollection;
}