Looking for a quick way to lock your screen and put the display to sleep on Mac OS X using Quicksilver?

1. Download Sleep Display.
2. Extract the zip file and move SleepDisplay to your Applications folder.
3. Run the SleepDisplay application at least once.
4. Fire up Script Editor and enter the following code:

   do shell script "/System/Library/CoreServices/Menu\\ Extras/User.menu/Contents/Resources/CGSession -suspend"

   launch application "SleepDisplay"

5. Save this script to a location cataloged by Quicksilver.
6. Create a HotKey Trigger in Quicksilver to run the script. I use command-control-shift-S as my keystroke combination.

I’m running Mac OS 10.5.1 on an iMac and this works great!