Lawmakers are skeptical about ad networks' willingness to take responsibility for their own behavior -- but the Network Advertising Initiative hopes to change that. It has signed up about 100 industry players, including Google, AOL, Microsoft and Yahoo, for a rigorous regulatory program requiring continuous review of companies' data collection, disclosures and opt-out policies. "What policymakers call for is self-regulation with teeth, enforcement and accountability. This is real and very tangible," says Executive Director Marc Groman.