The database marketing service provider (MSP) market continues to evolve, with a variety of entrants competing for space. Forrester's recent evaluation, "The Forrester Wave™: US Database Marketing Service Providers, Q1, 2011" focused on the top vendors in the market. But a host of smaller and emerging players offer compelling hosted marketing database services. In this report, we identify four subcategories of providers and highlight the capabilities of representative firms: ClickSquared, Direct Partners, Metrics Marketing Group, and Sigma Marketing Group.