No, I don't think they've stopped with Byron... last I've heard was the special Christmas episode that was a combination of Byron and Leviathan Chronicles-- have you heard that? And yeah, David is the man... perfect voice for the character.
I saw your post regarding other podcasts to pass the time between WA episodes. You mentioned a few I am quite fond of, particularly The Byron Chronicles. David Ault is the man! Anyway, what is going on with that podcast? Did they cease recording?