miRoamer is an online portal where you can access a diverse selection of Internet radio content. Blaupunkt makes cool audio devices particularly for automobiles. Put them together and you get a car radio/receiver with Internet Radio functionality.
All you need is a 3G connection (i.e. via your phone) and you tether the radio to your phone (via Bluetooth) to get Internet access. You can add your own stations if you don’t like the ones that it comes with by default.
They were only showing off some prototypes, as availability Stateside will be in the 2nd half of ’09 with tentative prices starting somewhere around 300 Euros. Ouch. Hopefully that changes by then.