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"Google has announced that they now accept \u201Cthird-party advertising tags\u201D for advertisers looking to buy inventory across the company\u2019s content network (i.e. \u2013 not Google search).  What this means is that advertisers can now use their own choice of software for managing ads, so long as that software is certified by Google.  Currently supported software includes:\n\n* Advertiser ad servers: DoubleClick (DFA), Mediaplex\n* Rich media agencies: DoubleClick Rich Media, Eyeblaster, EyeWonder, Interpolls, PointRoll, Unicast\n* Research firms: Dynamic Logic, IAG Research, InsightExpress, Factor TG\n\nYou\u2019ll notice that DoubleClick is prominently included in the mix \u2013 one of the first significant technical integrations we\u2019ve seen since Google\u2019s acquisition of the leading display ad network was finally approved.  This means that DoubleClick advertisers will now be able to buy ads on Google\u2019s content network through the DoubleClick interface, hence, increasing the likelyhood that even more online advertising dollars flow through Google."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2008/05/19/google-advertising-tags/>