I'll wait for my public flogging. LOL. Seriously, my children fighting and whining in the backseat are more of a distraction then a brief phone call. I find I'm about as distracted as talking to someone in the passenger seat. I think the real problem with the cell phones is the fiddling with them..holding them to the ear(so one can't turn their neck appropriately), dialing #s, etc etc. That's where the distraction lies. Either way, this is an individual abilities thing. Some people are just very good drivers regardless and can multi-task on the road, others shouldn't even have other people in the car when they are driving since they are so prone to distraction or don't have multi-tasking skills in this area.
Oh and my latest phone--bought a couple months ago is the Treo 755P.
No, it has to do with the wiring of the human brain. Using the phone is a distinct brain action that requires the same part of your brain that you use to drive. Things like changing CDs or radio stations, talking to the person next to you, yelling at the kids are all easily accommodated by your brain while you drive.
But when you get on the phone, different "circuits" kick in and you essentially are overloaded. Study after study (I can get them if you want) basically state that driving with a cell phone conversation is the same as driving drunk. The physical part of it (dialing, etc.) just takes you from drunk to really drunk.
It isn't a question of multi-tasking skills. It is a question of biology.
Now, before you take or make your next cell phone call in the car, especially with the kids, you need to ask yourself "would I make this drive drunk?" If the answer is no, then demur and defer.