Macromedia – Dreamweaver 8 Accessibility is an article on the Macromedia site that explains a few points about making data tables accessible with captions, summaries, and headers.
After using Dreamweaver 8 for a while, I can also guarantee that all the ideas I explained in Achieve Accessibility with Dreamweaver that used MX 2004 as examples still work in exactly the same way in Dreamweaver 8.