[Linus Gump]

Anything other than just "driving" while driving is a risky behavior. After 850,000+ commercial miles and countless personal miles I have seen too much of the aftermath of driver inattention. IMO anything more than a simpe AM/FM with a seek function is more distraction than you need, and even this is pushing the limits sometimes. Everything else is a bad invention when talking about driving.
Call me a Scrooge, but I have never been in an accident because of my own inattention, and my attention to the task at hand when driving has prevented a few accidents from other drivers not so attentative. It makes you wonder how many accidents could have been avoided if one or both of the drivers involved were actually paying attention to thier driving.