I haven't noticed it. They might implement a Quality Score system (whatever that is) like Google does, which did knock out affiliates , but not all.
Weird. I created ringtone affiliate landing page and dumped about 14000 keywords and they labeled my landing page a "link farm" and "irrelevant content". I've arguing with them over the phone for 2 hours, but it still hasn't been resolved. They don't even know what a link farm is (apparently they consider affiliate link a link farm). I spend 8 hours dumping 14000 keywords 200 at a time and my ads aren't showing. I'm quite pissed. They are still "trying to resolve this".