Fast User Switch trigger for Snow Leopard
I used to use WinSwitch for Fast User Switching, mainly the keyboard shortcut for the login window, when I wanted to “lock” my computer (eg. stepping away from it for a while). It had the added benefit of reducing menu space by replacing my User account name with an icon.
Using Services in 10.6, it’s not necessary to even display the User menu at all, since the login window can be triggered via a system-wide keyboard shortcut (I use ⌘+⌥+⌃+L)
Source: muasch.ch