Direct Marketing Association
"The Direct Marketing Association UK is Europe's largest trade association in the marketing and communications sector. The DMA was formed in 1992, following the merger of various like-minded trade bodies, forming a single voice to protect the direct marketing industry from legislative threats and promote its development"

PGiConnect
"Premiere Global Services is a global provider of on-demand communication technologies-based solutions that automate, simplify and improve communication-centric business processes.  Its end-to-end suite of platform-based applications, called the Premiere Global Communications Operating System (PGiCOS), helps approximately 60,000 enterprise customers worldwide increase sales, improve productivity and efficiency, and enhance customer loyalty and retention, by empowering them with new ways to communicate with, market to and service their constituents" 

Marketing Sherpa
MarketingSherpa is a research firm specializing in tracking what works in all aspects of marketing (and what does not.)