Web-powering technologies are currently experiencing rapid development. CSS (Cascading Style Sheets) is now fairly well known and is already giving way to more robust technologies like DHTML, LAMP, XML, and AJAX. Any one of these development platforms will enable you to provide a more powerful, interactive site than HTML can offer, but be careful not to get distracted by the bells and whistles. The costs of implementation, engineering, and ongoing maintenance can quickly add up, especially if you hire an outside developer.