Why not Flash Mem in Car Radios? (Score 1)

The news of Apple putting flash mem in their compuers makes me ask this: With all the car radios out that play mp3s off cd roms and dvds, why not have the manufacturers put a slot on the front of the dashboard unit for compact flash, sd-ram, usb flash, etc? Anything that is ATA should work and It already can read the filesystem off cd and dvd roms, so the cost should be minimal to add the interface. Then we dont need to burn cds of mp3s anymore, we can just use the thumbdrives or sdram chips. You could carry a whole library, hundreds of hours of music in an old tape case.