There is an indicator in oneiric, but it is part of the "application-indicator", and pulls settings from gnome-settings-daemon.
So, to enable it, add the input method via System Settings->Keyboard Layout, which is the gnome-settings-daemon config tool for this purpose. You'll get an indicator in the Unity launcher (but not the greeter) with a dropdown of configured input methods. Also, in that settings module, there is an "Options" button that brings you to a number of settings, including the keybinding for changing layout.
I just checked there there is a Tibetan layout available, and that it works. At least, it looks like it works to someone who can't read Tibetan. ;-)
I have also written an application indicator which, in my opinion, looks better.
It shows the state of the locks using filled/unfilled circles.
Default appearance of the indicator with Num lock on and Caps and Scroll locks
off.
Menu of the indicator, shown on click. The locks can be toggled by clicking
the respective item in the menu.
Alternative (short) appearance of the indicator.
You can also change which locks are displayed and in what order.
Installation:
sudo add-apt-repository ppa:adrianiainlam/indicator-keyboard-led
sudo apt-get update
sudo apt-get install indicator-keyboard-led
After installation the postinst script will prompt you for preferences configuration. Visit the GitHub repo for full explanation on these settings.
Usage:
The indicator will be configured to autostart on log-in. To start using the indicator after installation, log-out and log-in again, or manually start the indicator (search for "indicator-keyboard-led" in the dash).
The indicator should be shown at the top right corner, with a filled circle representing a lock turned on and an unfilled circle representing a lock turned off.
Clicking on the indicator should result in a menu with the three locks. Clicking on the menu item would cause the corresponding lock to toggle.
Bug reports and feature requests welcome.
Best Answer
F10, then cursor keys.
The key in configurable in the compiz configuration manager (not installed by default).