One of the more impressive new features in Adobe Dreamweaver CS4 is the ability to work with Smart Objects between Dreamweaver and Photoshop.
It’s now possible to import a fully layered, fully editable Photoshop file into Dreamweaver. Dreamweaver will help compress the file by comparing different format choices. And if changes are made to the original Photoshop document, Dreamweaver CS4 will recognize them and ask you if you want to automatically update the embedded file. Very cool stuff.