Macally PodFM

This little gadget plugs into your cigarette lighter, and is both an iPod charger and FM transmitter. It doesn't have preset channels, and instead, allows you to scan the entire FM frequency range to find the best reception.

Although it was designed for iPods, it is compatible with any device that has a standard headphone jack - which means your PSP, laptop, CD player or any MP3 player can be used with it.

It memorizes the frequency you last used at power off, and has quick set buttons also, so you don't have to search for a usable frequency every time you use it.