The idea of this is that people will be able to subscribe to categories (#3 (closed)) and receive a notification when that category is used in an annotation. For example, if someone is interested in metaprogramming, they could subscribe to that category and when we tag an annotation as
:metaprogramming they will receive an email.
Thanks to AndrewJDR for suggesting this idea. We must need an
:"Owl of Shame" category especially for Andrew, I'd say.