Comment 8 for bug 736097

@Oliver: the implementation I wrote (see linked branch) will pick up the default applications as defined by gnome-default-applications-properties. So if rhythmbox is installed and defined as the default music player, it will be listed in the home screen of the dash.

Note that the current implementation has some shortcomings as pointed out by Aurélien in his review, essentially the same shortcomings as unity itself.