This goal has the following fine print specified by pjh:
Experimental goal to manage a task backlog.
Datapoints submitted via Tinderbox.
Template tbx file available at https://github.com/pjjh/bmndr
(I've updated my local copy since then, will update if there's demand.)
This is a fancy sum of the square of the priority-adjusted ages of remaining items in my todo list.
Using a relative priority scheme based on http://stackoverflow.com/a/5689300
As suggested in http://expost.padm.us/backlogminding