from The Unofficial Apple Weblog (TUAW)

Picture it: you’re riding in the car and a great song comes on the radio. You’re dying to know what it is so you can go buy it ASAP but there’s no satellite radio receiver to tell you what’s playing. How can you find out what song it is? Whip out your iPhone, put it near the car speakers, and watch the screen. Poof! There’s the song, artist, and album.

No, I am not kidding.

Our own Erica Sadun was inspired by someone who came up with the original idea, she set off to make it happen, and the result is Listen. It’s still “very beta” but, hey, it’s still one of the coolest iPhone hacks I’ve ever heard of. Go check it out and let us know in the comments how it works for you.