Experimenting with drupal, I have now added a set of topics for blog entries, or a 'taxonomy' in Drupal. One of the neat things things about topics/catagories/taxonomy terms is that you can use them as a filter for the website, showing only content of a specific (set of) topics/catagories/taxonomy terms
It would be nice if all family members had their own set of topics that they could edit and moderate themself, but drupal doesn't readily allow that. On the other hand, 'sharing' topics is very interesting too, as for example my brother and I both like (buying) gadgets, and now we can create a single hoeben.net gadgets blog.
www.hoeben.net/topics