Completed
Statistics for individual tags
The ability to pull up a summary and/or graph of, e.g., how many times per week, month, etc. on average you use a particular tag; average time between uses of that tag; rolling averages or trends; etc. This would be a very useful complement to the correlations feature. Even if the ability to track custom quantities is not added in the future, statistics could still be generated for simple on/off tags.