DNN isn't a CMS. You only get CMS functionality with modules and whilst the core modules offer some, none of them have tagging. You need to look to third party modules for better content management. Ventrian's News Articles is gaining much more extensive tagging support over the next month and there are others such as DNNMasters Content Builder that should be looked at. In addition there are good document management modules available. Check Snowcovered or the DNN marketplace.

Even then, for a work environment I would suggest a more work-orientated tool such as Sharepoint.

Rob

I am taking a guess here that you're implementing Ektron CMS400.NET ??

The type of effort it would take to re-engineer DNN and all of it's different modules/content to take advantage of a user defined taxonomy structure would be a huge undertaking. It would also require that 3rd party modules have access to a "taxonomy" api so you would be able to assign taxonomy to any content regardless of module type.

IMO, any implementation of a true taxonomy structure would have to start with the core, then proceed with an available API, and then have adoption at the module level.