I don't want to split my site into multiple blogs, I just want to make it appear to be split into multiple blogs. I write on several topics, but one topic (category) stands out and is totally unrelated to the others, so I want to separate that from the rest by:
1) On the main page http://www.mysite.com, I want to filter out all posts from this category (and its subcategories) so that on the default mainpage all post except posts from the special category is shown, and vice versa on the special category frontpage.
2) I want separate themes for the categories. This I have managed to do already by creating a category-9.php-page and modifying it, but when viewing a full post (after clicking the read more-link) the theme reverts back to the default one. Can I make the custom theme be shown both when viewing the category and when viewing a post in the category?
3) Can I filter out the archive and search stuff too, so that when I search on the default page, the special category stuff is filtered, and when I look in the archives on the special category, then all the other stuff is filtered?
I guess what I'm trying to accomplish is to making it seem that I have two blogs, when they are really just several categories of the same blog.