Anyone tried this yet? It says that the Incredible has a headphone jack. Would you be able to plug the Incredible into an aux line-in on your stereo and play music off of the Incredible through your stereo? Wouldn't you also be able to stream Pandora over the 3G and have it play through your stereo as well? As long as you are in 3G coverage area, it's like free satellite radio!
Or, if your stereo doesn't have an aux line-in, you could also stream it over Bluetooth if your stereo can do Bluetooth.