I believe they use the WMA plug-in. If you're on a Mac, you're advised to used Flip4Mac. Whichever you choose, they make internet radio listening fun.
They have a unique concept - Click on the cocktail shaker and the icons of a number of stations in the frame changes. Keep shaking till you find one you like. You can even drag an icon to a column of "favourites".
Sounds like fun. Hopefully, This is Lounge can pickup some new listeners through this interesting concepts.
Give it a try!
RadioShaker.com
