I originally mentioned about part1 of this article on , and now part 2 of this article was posted on Techcrunch.
http://www.techcrunch.com/2009/09/26/yo ... b-part-ii/
Basically, these services can be worked on web pane of Jaangle, though I haven't try all of them on Jaangle yet. I think this kind of service is very useful to extend variety of private music collection, and I usually use them for BGM when I invite someone for dinner in my house.