Like a sleeping giant, Internet radio is quietly attracting more and more listeners and advertising dollars, leading some experts to predict that some day soon it will eclipse the popularity of satellite radio and iPods. ¶ Already, ratings company Arbitron Inc. ... says, some 37 million Americans tune into Internet radio at least once a month, up from 11 million four years ago. ¶ With its growing audience, it could start to take a bigger bite of the $11 billion spent annually on online advertising. Nevertheless, But Internet radio faces hurdles, say proponents, because digital copyright laws make it less viable than rivals. ... Link: Reuters.