It is an article posted by Theresa Crouse who writes for this website, and while many consider "survival" type info resources to be "far out" wackos, actually FEMA recommends families prepare for long term outages in cases of storms or other events that catch most families off guard.
So this article (referred to in the URL above) is excellent for everyday uses beyond the main, for coffee, as well as long term planning such as we have in the winter when ice causes power outages, sometimes for days at a time. And if you think this is just a "northern tier" issue, I was once stuck for 4 days in Atlanta, GA at a friends house when an ice storm shut down power and mobility for 3 plus days.
The author discusses such uses for coffee as compost, fertilizer, growing worms (yes, this could be very important), getting rid of odors, scrubbing dishes, saving plants, making soap, and more. It is a very interesting article when you view it for it's practicality!
So read this article online and when you're done brewing your coffee, don't throw the grounds out...just yet!