In order to install the beta of Dreamweaver CS4 permanently, you’ll need to enter the serial number of your Dreamweaver CS3 (which can be the stand-alone version or part of a Creative Suite 3). So, owners of Dreamweaver CS3 are able to use the beta until CS4 is released. Users, who don’t own Dreamweaver CS3 are also able to download the beta but they are allowed to use the beta for two days only. After the two days have expired, you’ll need to enter your Dreamweaver CS3 serial number.
There are also CS4 beta versions of Fireworks and Soundbooth available. The upcoming Fireworks will feature CSS and images export which allows you to export web standards–compliant, CSS-based layouts, complete with external style sheets in one step. This sounds very interesting and of course I will try Fireworks as well because it’s an awesome tool to create webpage-layouts.