I just read a quote from Gibson in a Iuvenalis post. I signed up for his newsletter back in 2010, and the last one I received was in April 2011. I suppose poor health was the reason he stopped, though he may want to update his website because there's still a sign-up box for the newsletter.
Does anyone know how long he published this newsletter and if there are archived copies anywhere? I think I heard he was sending them out since the 1970s. I'd like to get my hands on them all.