Dreamweaver MX 2004 has many powerful features that make building Websites easier, while also giving you more control over the site layout. We're going to focus on the new set of CSS tools and capabilities: the CSS Rule Inspector, improved CSS layout visualisation, improved CSS rendering, improved CSS Panel, CSS-based Text Property Inspector, CSS-based page properties and CSS code hint pop-ups.
These tools give you an amazing amount of control over the text and layout of Websites. If you're curious about whether or not to move from MXto MX 2004, the improved CSS rendering alone will make it worth the upgrade cash.