In honor of this new message board here's something that may not be widely known.
In 2006 PBS' History Detectives did an episode on a condolence letter Bill W had written on the passing of Herbert Wallace. They interviewed Mel B. and went to Stepping Stones to search for clues. I checked the old AA History Lovers message archive for 2006 at Hindsfoot.org to look for discussion of the show on the group and there were in fact questions asked at the time about the content of the show but apparently they weren't answered.
So here's the of the show and a piece of AA History that may not have been discussed yet anywhere else.