Google has released a “Placement Performance Report” which provides performance metrics for ads running on the Google content network. This is the first time that Google has provided conversion statistics about its content network.
Analytics for the search network, which would definitely be of more interest, is still unavailable. There is a screenshot of the report at Marketing Pilgrim. As Jeremy Lebuke has pointed out, Yahoo! is already ahead with Panama, which already provides reports for the search network. In fact, the higher level of transparency is one of the factors why Panama has registered a strong growth rate so far.