Well I just returned from the local nursery and they recommended Tomatoe and Blossom Set Spray. We'll see how it goes. She told me it was the extreme heat that was causing the plant to not produce fruit but this stuff would fix it.

Update: The hormone spray may have helped as I now have 5 new small tomatoes and there are a large number of new blooms. About a week ago I became concerned that I hadn't pruned or 'suckered' the plants as my grandmother taught me so I did some heavy pruning. I hope its not too late. The plants are enourmous.