Beneficial plants and insects - companion planting

This is the second in the series of readers questions. Today, companion planting and natural insect control, and another lady wanted anything to do with gardening; so two birds, one stone. ;- )I have to be honest and tell you that I'm not a real believer in the repellent kind of companion planting. I think that a few plants benefit being planted together, but in my experience it's not many.