I have never used DW but I have had clients who did and stuff is spread out all over the place in the source. You'll have a body tag, then a style tag following it, then another body tag, it's a MESS from what I have seen.
You would think, with most people going to the .css file for formatting an entire website quickly and in one swoop, that DW would use that method. Does it? If so, I haven't seen it used in any HTML page I have inherited from a client to date. There are styles EVERYWHERE in the code. And new styles with each new page. Maybe it's the users and how MW is set up, but I'm not paying for that, lol.
I use Stone's WebWriter
http://www.stoneware.dk/ , OOo, and Notepad, lol. All FREE by the way, smile. I'm into free stuff, lol.