I was about to tie a top heavy tomato branch to the cage when I saw this thing and almost had a heart attack. The Boyfriend picked it off, branch and all. It ate an entire row of cherry tomatoes. Well, not an entire one, you can still see a part of the last one on that row in this pic.
We didn't have the heart to kill it, so he relocated it across the street in the woods. A little google-ing led me to discover it's called a Tomato Hornworm and would eventually turn into a huge moth. Additionally, they leave behind poop droppings similar to rodents and can be found amidst your garden via black light at night. There is also a man on gardenweb (I think) who will pay for the shipping if you mail him them.