my wife and i replaced the car stereo systems to use an ipod as the source. we both have 80gb ipods as sources. if we go on a trip or want to listen at work, just take them out of the car. i also use an ipod touch that allows 16gb of music or a combination of applications, wifi connectivity to the network for internet access, games, and software to remote control a mac itunes server. the ipod touch is pretty versatile.
