I’m probably the last one to learn this key combination to lock computer. Before this week, I was locking my computer by pressing three-finger salute (Ctrl-Alt-Delete) to launch Windows Security dialog and then press Enter key in order to lock my computer. Starting this week I’ll be pressing only Windows Key + L.
I figure by pressing Win+L I’m going to save half a second per each instance. Let assume that I lock my computer 6 times a day. It means I’ll save 3 seconds a day and this adds up to about 18 hours minutes a year.
Vadim's Weblog 
You mean 18 minutes per year :P
Let me save you a few more minutes.
Win key + R = Run…
Win key + D = Minimize all window & remember which windows were on screen
(press it again to see the effect)
Win key + L = Minimize all
Real wonderful information can be found on blog . “Search others for their virtues, thyself for thy vices.” by Benjamin Franklin.
Oliver,
You’re absolutely correct. 18 minutes. My son is going to 1st grade this year. I’m going to study with him simple math operations. :P