Funnily enough I almost posted
this link to the NY Times earlier in the week with the same heading,
far less graphic but being interactive it's a pretty good demonstration to anyone who
thinks they can concentrate on driving while texting, of just how deluded they are.
(link goes to a flash game that tests your ability to change lanes accurately and respond to text messages at the same time. It's on the NY Times website so you may need to register to see the content, I'm not sure if they still do that)