We now have a way of determining the most valuable tags! Okay, okay, so it's all a bit subjective...
The query 'Most Valuable Questions' displays the top 500 questions, sorted by
votes/views, with the option to limit results to questions over a certain amount of votes.
This can be helpful in determining tags that have a high ratio of votes to views, for example, the story-identification tag shows up a lot in this list, even for higher-voted questions (much of the list at
votes >= 50 is story-identification, while at
votes >=70 it takes up 3 of the top 4 results, and no others).
Enjoy! and please, post anything interesting you notice as an answer.
A lot of people have mentioned how the data returned with this query is not representative of the majority of questions on the site, as the trend is skewed by low view-counts.
With this in mind, I edited the query to limit the results by view count, instead of vote count.
Here it is: Most Valuable Questions (Limited By Views)