I've found this thread very useful and I just want to add something.
You can change your toolbars not just by section, but also by node or class. For example you could have a different toolbar according to whether an object is an article, poll, folder etc.
If your article class is 2, then the following would be a basis for creating a tollbar option that just shows up in articles.
{switch match=$DesignKeys:used.class}
{case match=2}
This is an article.
{/case}
{case}
This is not an article.
{/case} {/switch}
This extension of the principle is probably obvious to all you "power users" of eZ publish, but I thought that people might appreciate me pointing this out.
Combined with the new administration setup on eZpublish 3.5, this is very powerful.
I was wondering about the same issue, until i found this tread.
I think that the administration panel should include a module that assign toolbars to nodes.. It's a must!