As a part of the project team for development of the first professional business web site in Bosnia, we developed our own framework for dynamic web site and content management. (managed by sayber.net as a contractor) We used PHP4 and MySQL as a development platform. Our team had 3 developers and one web designer. Site was developed in about 3 months.
Main functionalities we developed was: forms authentication with cookies, user management, content management with messaging and approval principles implemented, main site with lot of different widgets controlled by config file, reporting system, graphs, etc.
ps. this web page has quietly evolved in terms of functionality and graphic design until date