Confirmed for Jaunty.
$ wallpaper-tray The program 'wallpaper-tray' is currently not installed.....etc....
wallpaper-tray: Installed: 0.5.5-0ubuntu1
Confirmed for Jaunty.
$ wallpaper-tray ....etc. ...
The program 'wallpaper-tray' is currently not installed.
wallpaper-tray:
Installed: 0.5.5-0ubuntu1