Theme development

I have an idea for a site which sounds simple in concept but I need some help to get going.
- the site will be a multi user journal with some news/articles content inserted by an editor
- each year will use a different theme
- the home page should be simple, with just links to choose which years journal you want to read
- the default year would be the current year

Obviously the two basic issues are: forcing which theme to use depending on the year variable, and selecting nodes/comments that were created in the selected year.

Any ideas?

Hi, is it possible to customise the look of the navigation block without going deep into the heart of drupal? I would like that it outputs in a single line as follows:

username: create | view journal | my profile | logout

'create' would go to ?q=node/add
'view journal' would go to ?q=blog/#
'my profile' would go to ?q=user/edit

Using the 'example' theme page links appear in a vertical format, so I assume this is the default. But using 'marvin' they appear in a row. I have managed to work out I can change the delimeter, but don't understand where or how the links appear in a line, and is it easy to overide it so that the links appear vertically?.

Hi, can theme names have spaces in them? thanks, Kenny

I've got a modified version of xtemplate for Drupal 4.2 which is,

Hi there, (sorry, I am a complete newbie to Drupal)

I would like to do a template that actually has two levels in the navigation bar like this:

+-----------------------------+
| all node links in level 1 |
+-----------------------------+
| all node links in level 2 |
+-----------------------------+
| content
|
|
| node links of deeper levels |
+-----------------------------+