I ride my motorcycle as often as I can (im still nervous in the rain but have ridden over an hour in sleet, but I try to avoid it) and I listen to Pandora and use Google Navigation to find where I need to go. Usually I just stuff it in my jacket, but I also have a gas tank bag that has a map slot that I stick my phone in and it allows the touch screen to work, good for following the maps and such. For Pandora, I got an iFrogz earphone with micophone and use "Headset Button Controller" to control the Pandora. It lets me pause, skip and adjust the volume.
Anyone else have any good tips for riding with your Droid?!?