More to explore:
Pruning tomato plants make for sturdier plants and heavier yields. One if te best articles I've read in tomato pruning.
How to prune tomato plants for greater yield: Suckers form in the axils between the leaves and the main stem. Encourage a strong main stem by removing all suckers below the first flower cluster. http://www.finegardening.com/how-to/articles/pruning-tomatoes.aspx
Pruning tomatoes: Highly recommend pruning your tomato plants. Last year I pruned half of each variety I had growing in my garden to see if pruning had any effect. I was amazed when the plants that I had pruned started producing, they had at least twice as many vegetables and they were of larger size. Not only did the pruning increase my overall yield on those plants but it also made the plants easier to train up the posts I had in place.
Prune tomato plants for better fruit.