It is nice to be able to sort resources by rank, count, relevance, but I can only imagine how incredibly useful it would be to sort it by any of the headers available in the library window (e.g., subject, tag, date, etc,). Of course, many of the column headers can be emulated through search terms, but it requires how to keep up with proper search syntax and it does not provide the immediacy that the headers provide by simply clicking on them.
Now take this to the next level and allow multiple level sorting as in the analysis mode in Bible search, and we would be instantly transported to searching heaven!
What I mean is being able to sort any basic search results like this:

With multilevel filters as in here, but using the categories above instead:
