If you watch the demo video for context you can see how they use css classes to do exactly what you are talking about. I can't remember if the video is linked on the context page but the video is on the Development Seed website. 

- Brent
{Sent from my iPhone}

On Jul 4, 2009, at 0:48, Cristian Palmas <cristian.palmas@gmail.com> wrote:

2009/7/4 Brent Hardinge <design@bibleinfo.com>
I haven't looked for theme stuff specifically but the new context module may do things like that: http://drupal.org/project/context

- Brent
{Sent from my iPhone}

@Brent, @Paul

Thanks for your advices.
Indeed both themekey and context may be the modules I've been looking for what I had in mind, because I wanted to use a simple and intuitive navigation (primary links) and using path or taxonomy to separate the subjects into sections. Finally, for each section, I will set the relative theme.

I'll both give them a try.
Thanks again.
Regards.

--
~ Cristian Palmas ~
http://www.cristianpalmas.it

Chi vuole davvero realizzare i propri sogni, si sveglia all'alba

One who really wishes to realize his own dreams, wakes up at dawn
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