Not sure if this has been mentioned here:
"Adobe is pleased to make a technology preview available of the Adobe® Dreamweaver® CS5 HTML5 Pack extension.
This extension provides initial support for HTML5 and CSS3 in Adobe Dreamweaver CS5, and helps you easily create HTML5 pages and CSS3 styles. It also includes updates and WebKit improvements for Design View and Live View rendering.
While HTML5 and CSS3 will not be finalized for some time, the extension provides support for a set of currently-implemented features"
Interesting....I'm downloading now and will have to take a look at this later.