Steve and all:

Plant a bunch of Marigolds or Basil (or any strong, aromatic plant) in-between your Tomato plants. Once the season is over, chop up the aromatic plants and till directly into the soil.

Also, when planting your Tomatoes in the spring, place a collar around each plant buried 1/2 into the soil. An empty yogurt cup with the bottom cut off works well. This help keeps Cutworms from moving from plant to plant during the season.

Good luck,