public function coreBlockAbstractToHtmlAfter(Varien_Event_Observer $observer)
{
    $block = $observer->getEvent()->getBlock();
    if (!$block instanceof Mage_Page_Block_Html_Pager) {
        return;
    }

    /** @var Mage_Page_Block_Html_Pager $list */
    $list = $block;
    $products = $list->getCollection();

    Mage::register('current_products', $products);
}