I know there are probably about a zillion of these for the iPhone, but I haven't seen anything specifically for the Droid yet. I'm talking about a portable external speaker that I can use with batteries or plug in to an electrical outlet and then plug the Droid into it for music. There are many generic external speakers on the market, heck I guess I could even use a set of computer speakers for this. But I'm wondering if anyone has any specific recommendations? Thanks!