Magento - Create a CMS block in an upgrade script

magento_cms_block.php

$content = 'BLOCK CONTENT HERE';
//if you want one block for each store view, get the store collection
$stores = Mage::getModel('core/store')->getCollection()->addFieldToFilter('store_id', array('gt'=>0))->getAllIds();
//if you want one general block for all the store viwes, uncomment the line below
//$stores = array(0);
foreach ($stores as $store){
    $block = Mage::getModel('cms/block');
    $block->setTitle('Block title here');
    $block->setIdentifier('block_identifier_here');
    $block->setStores(array($store));
    $block->setIsActive(1);
    $block->setContent($content);
    $block->save();
}