I have added a new plugin called “WordPress Registry” in http://wordpress.org/extend/plugins/wordpress-registry. The main reason for building this plugin was because wordpress doesn’t readily have a central registry system where things can be stored such as variable values, objects, arrays. Which can be retrieved from a global space. This plugin basically tries to reduce db access/storage frequency and lessen the repeating declarations of variables and etc. It is something quite similar to Magento registry “Mage_Registry”, but very light version.
Hope this could be of a some use.