Search Engine Watch Forums moderator, abbottsys, posted detailed feedback on Google Ads Being on Yahoo Search. The Search Engine Watch Forums thread has only one post but deserves a lot more participation, in my opinion.

Normally, I would summarize, but I am not feeling so well and abbottsys does a great job, so let me quote him:

In the meantime, the DOJ is investigating the Google/Yahoo ad test. So even though some advertisers might love to see Google provide the search ads for Yahoo, the DOJ might prevent that from happening.

Forum discussion at Search Engine Watch Forums.