Sigh.
I did the same thing... on the blogs, when I didn't know about the forums. I finished up PP just about the same day all the podcasts stopped allowing blog comments. Bad timing, I suppose.
I've been scared away from doing it on the forums because of that "Are you SURE you want to thread-necro!?!?" message that pops up. I've never seen one of those before, and it's unnerving. (Also, a lot of the times I was really really annoyed by something, it turned out someone in the thread had already covered that point.)