In From the Perimeter I’m at the Direct Marketing Association’s annual massive trade show (DMA*05) in Atlanta. While there are lots of things to potentially blog about, I think the most interesting one is the simplest. When I started attending the DMA’s shows six years ago, the only interactive marketeing companies who exhibited were email vendors and the occasional sweepstakes company — and any interactive marketing company who did bother to show up was relegated to a small booth space in a corner of the trade show floor, away from the real action. A friend of mine once told me it was easy for him to hit all the email guys at DMA — just walk around the perimeter of…