A number of people mentioned that the FM transmitters that enable to use media players with car stereos do not perform as great as we would like. Donn provides a step by step guide to add an auxiliary input to your stereo, so you may use your choice of media players such as the Apple iPod and Creative Zen in your car (here). If you wish to do it yourself, these instructions are provided with pictures and diagrams.
Via: Lifehacker
Picture by opus2008 (Creative Commons)