We don't try to generate all of the CSS for you, because we'd most likely not be able to do a good job. We'd be trying to reconcile duplicate rules, pick meaningful class and selector names, etc. We could do some potentially clever things, such as using layer names for classes, and layer groups to help us understand structure. But, it is very common to see PSDs that have poorly or default layer names and a lack of organization. So, rather than doing something poorly, we decided not to try and do this.
The good news is that since you're a Dreamweaver user, you're about to get something super cool that will help you out with this, making it a breeze. Keep your eyes open for this news - it is just a few days away.
I'll be teaching a beginning Dreamweaver class on Tuesday. Would there be any updates before then? Can you recommend a good tutorial site to use? I'm planning on using the Adobe product page one, but didn't know if there were any other good ones.
We can't speak to exact dates, as Bruce said there's some really cool updates to Dreamweaver coming soon... stay tuned!
By now, hopefully you've seen the new announcements we made at MAX for Extract for Dreamweaver, and the other related Extract announcements.
I hope this is what you were looking for.