We have a few long carrides coming up and I am wondering if some books on CD would make the drive easier on the 2 littlest girls. Our library doesn't seem to have anything geared towards littler kids though (that I can find anyhow). Any suggestions on where else to look? We have an Ipod nano that we could download onto. Or any suggestions on series that would appeal to a 4 year old (maybe I can search the whole county library system if I had some ideas)? Thanks!