With my original iPhone 2G, I used a Monster solution to output the audio to my no-dock, no-RCA equipped car. Along came the iPhone 3G and while the Monster still worked, it no longer provided power. See, Apple in their Infinitely Looped wisdom decided to remove the FireWire pin from the iPhone 3G dock connector, and that was precisely the pin many peripherals used to transmit charge.
That was a problem for me, since my daily commute to work is an hour to an hour-and-a-half, and I typically listen to podcasts and audio books there and back again. Without power, my iPhone's charge was taking a hit!
Enter the Griffin RoadTrip with Smartscan. It transmits iPhone (or iPod touch) audio to your car's FM radio, and most importantly for our perpetually draining devices -- it charges as well.
I've spent a month with it now, putting it through it's paces on the Hoth-like roads of a Montreal winter. How did it hold up? Read on to find out!