Triggering ScreenSaver (and lock) with a shortcut on Snow Leopard

I've been using this for a long time, but lately I've found that it wasn't working so well (The screen saver would launch and then stop right away).

Initially, I was using quicksilver and the guts of the ScreenSaverEngine to run something like that:

 open '/System/Library/Frameworks/ScreenSaver.framework/Versions/Current/Resources/ScreenSaverEngine.app'

There is a better way to launch the ScreeSaver, it's to use the following applescript

tell application "System Events"
start current screen saver
end tell

Finally, the main problem was that I was previously using this trigger with the key combination ⇧⌘L 'on press', but it's much better to use 'on release', solving a race issue making the screensaver exit almost immediately.

So to sum up:

1. install Quicksilver (of course)
2. enable triggers (maybe it's only in Beta?)
3. make sure you have the "Run as Applescript" action (might be in a plugin?)
4. add a trigger
5. in the item section, hit '=' (to type a text, instead of triggering a search)
6. paste the apple script above
7. select the "Run as Applescript"  action
8. select a 'on hold' hotkey