I'm a user of the Twones service.  I would be interested in a script or built-in support of this service in Amarok.

http://www.twones.com
http://www.twones.com/pages/api

They only currently support windows based music players. 

This might be worth having a look at somewhere down the road. As always though, stuff like this is most likely to happen if a dedicated user of both Amarok and the service in question decides to have a go at developing it!