Before anyone points me to it, I have already read http://codex.wordpress.org/Installing_Multiple_Blogs
The things is I have a much more specific question..
Is there a system that allows multiple users to write on different blogs, where the user information is retreived form a single database? The different sites can also draw their content from a single database too, provided that there is a way so that only posts that match a certain criteria (ie. tags or categaories) are displayed on a blog.
I have a few websites which concentrate on different topics ( http://www.foliolar.com , http://www.sanatfolio.com , http://www.pazarfolio.com , http://www.sporfolio.com , http://www.teknofolio.com ) I initially thought that having separate WP installations wouldn't be a problem since Fantastico makes it really easy to install them all. Anyway, there are about 10 authors in this network and most of them usually post in one main blog but I also thought that it is a good idea to let them post in different blogs just in case, so I created all the users in all the blogs. The thing is, now we're thinking of opening a few more blogs with different topics and I really don't think I can go in and manually enter user information again..