Shortly after releasing Dreamweaver CS5, Adobe have just announced an add-on pack to support the new upcoming standard HTML5.
The Add on pack brings a variety of new features to help develop with HTML 5 :
Code Hinting for HTML5 Tags
Improved CSS rendering in Live View
HTML 5 Starter layouts for new documents
Support for <video> and <audio> in Live View
You can see more details and download the pack using the following link:
It can be tricky to talk about whether or not this is good, but only time will tell, as with most superb design.