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.