Lynda Weinman, of Lynda.com, commissioned a developer to create an extension just for this.
It installs a button on the Dreamweaver MX toolbar and an extension that imports ImageReady HTML into Dreamweaver.
The extension is on the CD that comes with Photoshop 7/ImageReady Hands-On Training, by Lynda Weinman and Jan Kabili, or, according to the book, free on the Lynda.com site at
http://www.lynda.com/files/
The file, by Mossimo Roti, is called ImageReady HTML.mxp
I've been using it for about a week and it works like a charm.