Patrick van Staveren <pvanstav@cs.wmich.edu>
Kemal Ilgar Eroglu <kieroglu@math.washington.edu>
Mario Streiber <mario.streiber@gmx.de>

Portions from the xfce4-sample-plugin, written by
Benedikt Meurer <benedikt.meurer@unix-ag.uni-siegen.de>

Progressbar update code based on code from gxmms by 
Aleix Conchillo Flaque <aleix@member.fsf.org>

Also code from XFCE 4.2 volume control panel plugin is used.
