For the past couple of days, I've been noticing that serverfault has very prominently placed ads for each question, which doesn't seem to be present in SO.

I don't usually mind the ads on the side in SO because it's not too prominent, and most of the time is relevant. But this serverfault ads are really nagging me.

I thought Jeff was all for discreet relevant ads that don't detract the user from his experience. What's happening?