Volvo at the Chicago Auto show this morning said it would give its XC70 crossover wagon a unique rear seat entertainment system. The RSEi-500 will be a full-fledged touchscreen computer based on Windows XP but will have its own custom interface for media navigation, including cover art and details for music and DVDs. It should also have an always-on Internet connection and will uniquely run on a Sprint Overdrive that can share a 3G or WiMAX connection over to both the RSEi-500 and to other devices in the car through Wi-Fi.