Comment 5 for bug 273220

Rhythmbox does not keep an icon in the notification area unless you enable that plugin. To do so is a violation of the GNOME HIG. That's also why hitting the X on Rhythmbox closes it, rather than sending "to the tray" which isn't *really* a tray. It's a notification area. It's *just* for notifications (according to the HIG). The media players that do that are not following GNOME's guidelines.

I would say that if you have Pidgin minimized and want to bring it back, you'd probably click on it in the window list. Or you can alt+tab to it. How do you open any other minimized window?