Tom Szaky didn't even try to get his product--a worm excrement fertilizer packed in a recycled bottle--into small retailers when he started TerraCycle six years ago. Instead, he reached as high as he could: Wal-Mart. "If I want to be big and do it quickly, the best way … is to work with the world's biggest companies," he says. "They can accelerate your cycle much more quickly than any other company can."