Through these you can pull tunes from just about anything to play on there, but if you tether the device with a phone to provide connectivity (or plug in a USB modem, or connect over WiFi) you can stream music directly on it. It also offers Google Navigation, including traffic and all the niceties you've come to expect from your smartphone -- but on an admittedly tiny (3.2-inch) screen. Connect a music device over USB and it'll index the contents via GraceNote, letting you speak any artist, album, or song to play it directly. The Asteroid ships to the US in October for $349. If you have room for a little more Android in your life, maybe it's time to make a little more room in your dash.
Parrot Asteroid Android-powered car stereo