In this blog I've often talked about why enterprise wide tagging with context is important. Here is some data from participants who attended a recent Scientific Computing webinar. Click upon the thumbnail to see the survey results. An intelligent tagging solution which includes the ability to create a tag, while saving those tags as favorites in a category list ... subscribable by other users via RSS ... is part of the solution.
In other words, the key is allowing your users to create "context". See more of my posts on this topic.
- Scientific Computing Knowledge Management Article
(includes links to the webinar and a pdf copy of the discussion)