Disclosed are methods and apparatus, including computer program products, implementing and using techniques for generating advertisement information for performing a marketing campaign on behalf of an advertiser. The advertiser has an associated computer in communication with a data network. A plurality of electronic publishers in communication with the data network are used. In one aspect, the method includes receiving, over the data network, information describing subject matter of the marketing campaign. Advertisement information is generated based on the received information describing the marketing campaign subject matter. A plurality of instantiations of the advertisement information are generated using publisher parameters associated with the electronic publishers. Each instantiation is in a format appropriate for a respective one of the electronic publishers. At least one of the generated instantiations is provided to the respective electronic publisher over the data network.