I've noticed that sometimes a link appears in the text of someones posting. It is red and underlined twice (like the link in the upper right of the forum's background) and leads to some in line site. I don't think the poster has anything to do with it, and there doesn't seem to be any pattern or regularity.
It just drives me bananas by interupting my thought flow - like a bump in the road. I don't mind the banner ads that have always appeared away from our text, and do click on those sometimes.
I've also noticed that sometimes in the early morning the site crashes, just like it did a while ago before the forum went to another system. That, oddly, I understand, and it's OK because I am free and can pretty much time my visits to avoid clogging up the system.