$configValue = Mage::getStoreConfig('general/store_information/name');
$configValue = Mage::getConfig()->getNode('custommodule/general/setting_name');This example retrieves the "setting_name" value from the "custommodule/general" section of the custom XML file defined for a custom module. It can be used to access any customizable configuration settings defined in a module's XML files. Package library: Custom Module