I'm using b2evolution for a Knowledge Management initiative as it seems like a great way to get people to blog/write about their experiences etc, which is the first step in getting an organisation to do KM better.

What I need is the ability for users to find what others have written on a topic, without doing searches through many many blogs. I am thinking that the ideal way to do this would be to have the "categories" managed centrally rather than on a per-blog basis, so that if someone creates (or perhaps only the admin should create) a new Category, all blogs are able to see that category and use it as a property of their posts.

Currently, blog A can create a category called (for example) "Colors" and blog B might create "colours" and someone else might create "visual textures" and they will never find each other. In my case, I might need a Category called "Thailand National Leaders Conference 2009" so that any user can find all the posts by anyone related to that topic.

Maybe there is a better way of doing this (like with tags?) but I am dealing with very unsophisticated users who are not tech-savvy in most cases, and I need to keep it as simple as possible.

So... is there or could there be an option to allow centralised management of Categories?

Alternatively, is anyone using b2evolution for KM and do you have any suggestions as to how I can meet this requirement? I am also interested in networking with anyone who is using multi-user blogs for KM.

Thanks in advance!!!