Machka, a car is a safe place to be (assuming a hardtop, with the windows up) because the electricity from the hit will flow around the car, on the outside. The occupants are safe, as they are in side and not a part of the path. It's an electrical phenomen that high frequency electricity (which lightening is) flows on the outside of conductors, not on the inside of the conductors. A rubber tire does nothing for a bolt that has already traveled a mile or more.
While an Ipod may increase injury, I suspect one would be already at a high risk of injury, if lightening was a risk to begin with. Lightening is well known to jump and take multiple paths at once. Odds, one might already be a path to begin with--and the Ipod, while not helping, isn't really affecting the odds of being hit--which is what the real story ought to be (News Flash at 9: Lightening Proven to be Dangerous to your Health!).
I wonder if they ought to say the same thing about metal framed glasses?