Next weekend begins DMA•06, the direct, interactive and database marketing industry's biggest event of the year. Expect more than 10,000 people from the United States and overseas to network and learn, and 500-plus exhibiting companies to display their prowess and wares at the Moscone Convention Center in San Francisco. They all seek to blaze new trails in marketing and commerce. That's why they should take a moment to remember Gary C. Comer.