His excellent "How to Speak" lectures can be found at https://www.youtube.com/playlist?list=PL9F536001A3C605FC
https://people.csail.mit.edu/phw/favorites.html
Was this ever finished?
It's in the final stages of publication — I've seen an editor's print in its final form — although I'm not sure what will happen to it now. I would guess it will still be published.