Attaching a taxonomy to a user? This will help. I was thinking just the other day about how to go about it, and this post by Justin Tadlock seems to answer all my questions on that.
Link: Custom user taxonomies in WordPress – (http://devpress.com/blog/custom-user-taxonomies-in-wordpress/?utm_source=rss&utm_medium=rss&utm_campaign=custom-user-taxonomies-in-wordpress) from (author unknown) at DevPress
