Opera 9 + Ubuntu or Kubuntu - get rid of the tray icon

The tray icon for Opera can be hidden by launching Opera with the switch “-notrayicon”. To do this, open a terminal window and enter the following:
opera -notrayicon
Opera will launch without an icon in the notification area. This works in ubuntu and kubuntu. An alternative method is to type Alt-F2 and enter “opera -notrayicon” into the [...]