My car stereo does not have a 3.5mm stereo plug, nor a tape player, so I'm looking into an FM transmitter I can use with the Droid. But here's the catch, I'd prefer to be able to charge the droid as well. I know running Pandora will likely drain my battery on long trips. Anyone know of such a product? I guess the alternative is to get a 2:1 adapter where I can charge my droid and run the transmitter, but I really don't want a mess of wires.