I just swallow my pride and pull over to let them pass if possible. A good WTF look and hand gesture makes me feel better but they are typically clueless.
Like Skillet says, the ****** cell phones are frightening. DC/NY and NJ have laws against cell phone use but I can see minimal enforcement. I live in MD and my wife works for a state legislator. I've tried to get him to propose a bill against cell phone use but he has no interest. I followed him on the interstate one day and he is a prime offender. Every one of my vehicles has a hands-free device so I try to practice what I preach.
