Comment 81 for bug 520118

Erwin there is ppa-purge, see here

http://www.webupd8.org/2010/04/ppa-purge-now-available-via-getdeb.html

changed packages in my system were exo-utils thunar thunar-data xfce4-battery-plugin xfce4-clipman-plugin
  xfce4-datetime-plugin xfce4-dict xfce4-fsguard-plugin xfce4-governor-plugin
  xfce4-mixer xfce4-mount-plugin xfce4-notes-plugin xfce4-panel
  xfce4-places-plugin xfce4-power-manager xfce4-power-manager-data
  xfce4-quicklauncher-plugin xfce4-settings xfce4-systemload-plugin
  xfce4-timer-plugin xfce4-weather-plugin xfce4-xkb-plugin xfdesktop4
  xfdesktop4-data xfswitch-plugin

hope it helps

Antonio