Login window shortcut for 10.6/10.7

This has plagued me since I've stopped using Quicksilver/GSB (Google Search Box) - no shortcut key to the login window which I like to use to lock the screen. I start locking my screen out of habit due to abusive coworkers, but slowly relied on it for basic security - all my stuff is online. Due to delicious delicious cookies, you can probably look at a ton of personal stuff online. Anyhoo: http://superuser.com/questions/45740/fast-user-switching-apple-menu/46308#46308

Great article, <3 keyboard shortcuts, <3 my mac again (not that I stopped).