Converge, formed in 2006, is made up of eight midsize PR firms, detailed below. The network says its goal is to offer national reach and in-market resources to all of the agencies' clients.

Margaret Booth, president of M Booth & Associates, says in the first eight months of Converge's existence, there's already been a significant amount of interaction among the agencies - "more than I thought there would be," she says.

Booth thinks the combined arsenal of the agencies makes all of ...