Ad net Turn Inc. has announced its second big raise just this year… The Redwood City, CA-based company has taken a $15 million third round led by Focus Ventures, along with past backers, Norwest Venture Partners (NVP), Trident Capital, and Shasta Ventures. The company announced a $15 million raise back in March, though actually that round was closed last year. It has now raised a total of $37 million. The overall numbers look impressive for Turn: The company is the 16th largest ad network, per *comScore’s* measurements, and it did 1.9 billion ad impressions in July. CEO Jim Barnett, formerly the CEO of AltaVista, told me they’re benefiting from superior targeting technology, a model that combines CPA and CPM models and a high level of control for publishers, ensuring that they won’t receive brand-denigrating ads. The money will be used to add personnel in sales and client services, expanding beyond its current staffing level of 40.