Adam Smith would appreciate this simple design goal for the Snippet Manager:

Immediate Feedback

There should be an instant reward for the user who adds metadata. This conforms to idea that a tool should be useful to the user first, and to the community as a beneficial side effect. Source: How to Build a Snippet Manager

In this pdf and elsewhere, "facets " is gaining traction as an approach to creating and querying metadata. I hope this continues, because the popularity of tags increasingly reminds me of the "Trouble with Tribbles."