this isn't exactly a solution but why don't you buy an old ipod off ebay. you can get a 30gb for less than 50 bucks. usually ipod batteries go to shit, but since it's sitting in your car getting charged you never have that problem. you can get podcasts which is pretty great too

also having an old ass ipod doesn't matter that much since it's sitting in you center console anyways... i've had the same ipod after 2 change in cars. thing must be 5 yrs old and still running.