Without turning to Google, do you know the terminal command needed to log out of Unity? If not, Power Commands brings a slew of session commands to the Dash.
A refined, compacted session indicator has landed in Ubuntu 12.10. The new applet merges items from the previously separate User and System menus into one new look, unified drop-down.
An updated Session Menu containing links for various system settings has landed in Ubuntu 11.10 this weekend.
A menu entry for 'Control Centre' has been added to Ubuntu 11.04's Session Menu.