Oh, I agree. Ms. Castro's book is terrific. Forgot to mention it. I read that before I saw the lynda.com video.
InDesign keeps changing things so drastically, that when I upgraded to 5.5 it made a lot of her InDesign advice obsolete for me, but the stuff about the CSS and HTML code is still quite relevant.
Here's a thread
I found where people talk about their workflows. I think it's incredible how many different ways there are of doing this - probably as many different ways as there are people who are doing it. Anyway, definitely some good ideas there. I'll post my workflow there, if and when I ever nail it down. It's still in flux and I'm not 100% happy with it yet.