The project was started six years ago:
We would say stuff like, 'People really use YouTube as a music player yet it really sucks for that purpose ... it's too unorganized,'" the anon wrote to Wired. "And then, 'YouTube does make a good music player but you can't play all your songs on it since the obscure ones aren't uploaded,' then eventually, 'Hmmm, what if you were to combine music websites like Myspace, Yahoo, YouTube and others?
You can read the rest of the article for the technical aspects.
The program runs a Java applet, so some people are weary of using the progam.
Is this a program you would so?
If so, do you feel that it is safe to use?