What it is: The RoadTrip device combines an FM transmitter for playing an iPod/iPhone through your car stereo speakers with a car charger. The device also includes Griffin's SmartScan technology, which searches your "radio dial" for the three clearest broadcast frequencies, then puts them in as three presets (you have to turn your radio to those frequencies yourself). A flexible steel neck lets you position your iPod or iPhone into the dock as well as the car charger port, and a Line Out port is included if you have one of those fancier new cars with an auxiliary port (but then you don't need the FM transmitter).

Why it's cool: I've been looking for a way to enjoy the music on my iPhone and avoid having to listen to regular radio for a while (I discontinued the satellite radio service in my car, and abhorred having to return to "terrestrial radio"). With the amount of cool music services available on the iPhone (including AOL Radio, Pandora and the Slacker service), as well as my own playlists, I was looking for a device that would not only transmit content to the stereo speakers, but would recharge the device as well. The recharger is a key attribute, as accessing these music services requires a connection to the AT&T 3G network, which tends to drain the iPhone's battery. The SmartScan feature also is very nice, especially if you live in an area where it's tough to find a clear frequency not being used by a radio station.

Some caveats: In my tests, I occasionally would get some static on these "clearer" frequencies, but it wasn't so bad that I needed to switch to another station. Also, you will need to use one of the custom dock inserts to fit your particular iPhone or iPod model to help prevent it from slipping (especially if your car ride is bumpy).

Grade: 4.5 stars (out of five).

The scoop: i2i Folding Portable Speakers, by Aerielle Technologies, about $40.