There have been anti-texting-while-driving apps already, but State Farm's On the Move app actually tries to eliminate your urge to text back—by texting back for you.
Launch the app, and while it's active, it will text back anyone who tries to reach you with a pre-determined message. It doesn't, unfortunately, automatically detect when you're driving, so you have to manually set it on and off. But you can also use it for auto-responding during times when you don't want to be disturbed, like when you're at the movies, or taking a nap, or taking a nap while driving. [State Farm via Gawker TV]
Update: State Farm says that they're working on GPS functionality to know when you're driving.