They've had that for years now ... you plug the little thing into your CD player or any other device with a headphone/audio output and it modulates it to an FM frequency you can tune in. The only thing is that they have very limited range (unlicensed transmitters always do) and the audio quality is lacking in the highs and lows. But still a nifty gadget.

I found this one on the web: http://www.hobbytron.net/product1349.html though it seems way over priced, I have an older one (bought it 8 years ago for 20 bucks or so) kicking around that I got at Radio Shack.

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