TUAW Tips: Get a better view with Quick Look
Quick Look is such an awesome feature of Mac OS X 10.5 and 10.6, making it really fun and easy to view files and folders from anywhere on your Mac. But what happens when you have a folder with multiple items and want to get a better idea of what's inside? Well, you could always just open the folder in Finder, but there's a cool modification you can make to get an even quicker view.
You can get this working on your Mac in a few simple steps:
Quit/Relaunch Finder using the Force Quit menu
Open Terminal
Paste (or type) the following command:
defaults write com.apple.Finder QLEnableXRayFolders 1
Relaunch Finder
The contents of the folder will now be shown when you use Quick Look. In true Apple elegance, the files will even fade and cycle through the contents.
[via Mac OS X Hints]