Griffin has introduced the RocketFM, which uses any available FM frequency to transmit audio through any home, car or office stereo system. Applications such as iTunes, GarageBand, video soundtracks and even streaming internet radio can be conveniently broadcast with RocketFM.
Laptop users will find the RocketFM invaluable for travel. Any available radio can be used as wireless speakers. The RocketFM is small and light, and requires no additional power source.
Any Mac or PC with USB can use the RocketFM.
More information is available at the Griffin site.