This dockapp combines a CD player and a mixer in one 48x48 window. Very efficient on screen real-estate. Especially handy if you mainly want a mixer, and only rarely use a CD player, but want to have one around just in case.

It's designed with WindowMaker in mind, but it works fine with any window manager, and can be swallowed by afterstep/fvwm/gnome panel/etc.