Are you sure you really want one of these things? I ask this question because in general, they suck - particularly if you live in a fairly populous area.

A better option (if your car is less than 10 years old) is to go with an iPod integration system. Many companies make these and there are units designed specifically for your car. They charge the iPod, and allow you to control it from your factory stereo. In many cases, they'll even display track/album/artist info on the stereo's screen.

They're a little on the pricier side (usually around $100). But in my opinion, it's worth it just to be able to tuck my iPod/iPhone safely out of view and still listen to it. Installation is the big issue, but if you've ever installed a car stereo, it shouldn't be too much trouble. And of course, there are many shops who can do it for you.

What kind of car do you drive?