Formerly (?) the leader on consumer privacy, Yahoo! already has an opt out cookie. Surely they will now offer the browser plug in as well, perhaps in bipartisan spirit building on Google’s open code. Will they expose the users’ interests to themselves? I would say, yes — not much work, it doesn’t have to completely show all interests and demographics you are tracking about them (right?), and it creates premium inventory (someone who has helped build their own profile!).
What about AOL/Platform-A? From there, how far down the chain will full disclosure and opt-out go?
Certainly the survey so far indicates a pretty wide range of policies about opt-out. Here’s the list of ad networks or other cookie collectors who don’t have opt-outs (that I could find, and I emailed many of them to confirm):
amazon.com (affiliate network)
cj.com (Commission Junction)
I suppose these are the players who have furthest to go, and we will expect to lag in anything Google and the other big players do.