An introduction to the sierra-php framework article has been published in the June 2009 issue of php|architect magazine. The full article is now available in PDF format here: http://c0423401.cdn.cloudfiles.rackspacecloud.com/sierra-php-phparch-jun09.pdf.
Version 1.1.4 includes a handful of bug fixes as well as a new authentication feature allowing for designation of a login smarty template to be used for authentication instead of only the standard http authentication available in the previously release. For more information, review the documentation provided in app-config.dtd.