My goodness! I save my coffee grounds and put them in my garden. If you are in a remote off-trail area- disperse them on the ground. If in a more used area or a standard campsite, hide them in the bushes or burry them away from camp - dispose of them while on the trail. "Leave no Trace" does not mean that you do not use some judgement. I can see Phat's point, because my understanding is that in a lot of Canadian wilderness you are required to camp at designated campsites and there are grizzlies.