According to the Arbitron Inc./Edison Media Research 2006 study*, developments in technology have dramatically increased options for audio programming.  Internet streaming is at the forefront of this emerging field, and online radio is poised to grab a significant portion of desired audiences.

More than one in five have listened to Internet Radio in the past month.
The weekly Internet Radio audience has increased 50% over the past year
Nineteen percent of persons age 18-34 have listened to Internet radio in the past week
Internet radio audience skews male and younger, but attracts a wide range of ages.
More than eight in ten Americans are online from any location. At-work streaming has increased an average of 43% each year over the last five years.
Internet radio attracts an upper-income audience, with weekly Internet radio listeners 36% more likely to live in a ousehold with annual income of $100K+ than the general US population 18+. 41% of online radio listeners have visited a website due to an ad.
Internet radio is used as a soundtrack for online shopping/buying, with 57% of weekly internet radio users reporting listening while purchasing goods at a website. Radio web site visitors are highly loyal, with two-thirds of station web site visitors visiting weekly, and nearly a quarter visiting daily.

* Arbitron Inc./Edison Media Research 2006 study “The Infinite Dial: Radio’s Digital Platforms”