The scoop: iTrip Universal, by Griffin Technology, about $40.

Click to see: The iTrip Universal

What it is: Portable music player FM transmitters have been around for a while, but the latest version from Griffin lets you connect any MP3 player (iPod/iPhone, Sony, Sansa, Samsung, Creative, etc.) to the device and transmit the audio to any nearby FM radio, so you can hear the music through the radio's speakers. It's mainly designed for listening to your portable audio player in the car, but this works with radios in the home or at the office as well.

The iTrip Universal includes a digital display that lets you choose what frequency you'd like to transmit to, which is helpful if you are in an area where lots of low-frequency radio stations are competing for air space.

Why it's cool: The device is very easy to set up and use. Once powered up all you have to do is plug the jack into your device's headphone jack, press play on your music device and listen to the music (as long as the frequency on the device and FM radio match).

Some caveats: The device is powered via USB, there's no replaceable batteries like I've seen with other devices. This saves you money on batteries, but it's odd having to recharge the device by going back inside to your office or home to connect to your PC. Also, the range between the device and FM radio is a bit deceiving, I had to position the device practically on top of the radio in order to avoid some static during my transmissions.

Grade: 4 stars (out of five).

The scoop: i2i Stream, by Aerielle, about $100.

What it is: The i2i Stream is a pair of tiny wireless streaming devices (two come in one pack) that let you broadcast content on one audio device to others. Additional i2i Stream devices can be connected that let you stream one-to-many as well. The devices are charged via USB, and include volume/mute buttons, and can connect to any audio player with a headphone jack. In addition, music from an audio player can be wirelessly streamed to portable speakers. You don't need to attach headphones necessarily.

Why it's cool: Kids who have to share one iPod can now both listen to the same song during a car trip, saving potential arguments about who gets to use the device. When working out, you can leave the iPod on a table (within sight so it doesn't get stolen), and stream the audio to your headphones attached to the i2i Stream (it comes with a wearable lanyard). The streaming capability is easy to operate – the "broadcaster" just picks one of seven "colors" (aka frequencies) to transmit, and anyone that wants to listen picks the same color on their device.