I'd second the motion about paying a subscription to not have pop-up or pop-under ads.
I don't think I'm alone in this, either. Pop-(anything) ads are the most annoying type of advertising possible, and I'm saddened to see the IF/Webflyer/FT folks going down this road. Put an extra ad in the static HTML of threads or the like, but please lose the pop-up/pop-unders.
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Saving the world, one clue at a time.