Another gem from CNET:

“If you use an FM transmitter to pipe music from your MP3 player to your car stereo, one of the key factors in an enjoyable listening experience is getting static-free playback. In order to achieve this, it's imperative that you find an open FM frequency in your area. This can be a bit of a crapshoot while sitting in the car (and you should never do it while driving), but one handy Web site can help your efforts. Visit Radio-Locator.com, then simply type your city or ZIP code into the box, and click ‘Go.’ You'll be presented with a list of channels ranging from ‘Best’ to ‘OK.’”

Photo CC 2.0, macwagen