From East Bay Technologies:
iWire Broadcast is the ultimate Internet audio browser, far exceeding what other media players bring to the table. Browse over 10.000 live radio stations from all cultures and musical genres. Find radio shows, educational broadcasts, and enough tunes to make your AM/FM tuner feel sorry. iWire Broadcast uses streaming media, so it plays almost instantly and doesn't take up any hard disk space so you won't run out of room.