There honestly has not been much discussion in the various forums about the recently released adCenter beta by Microsoft. There is a thread at Search Engine Watch Forums that calls the new beta more confusing and has slightly more bugs. But with that, coincided reports via WebmasterWorld that advertisers in the adCenter program, noticed their traffic from adCenter increase dramatically.
WebmasterWorld adCenter moderator, Receptional, said:
It's morning now and apart from one of our accounts being on pause for no discernable reason (yeh... they are still looking into it... come ON Microsoft!) we are piling on the bids so fast that we are experiencing really dramatic increases in volumes but can't directly attribute this to a change in the query share.
People suspect the increase in traffic is due to Microsoft switching on content network by default for all these campaigns.