X-Ray Your Folders w/ QuickLook in Snow Leopard

Type "defaults write com.apple.finder QLEnableXRayFolders -boolean yes" without the quotation marks into Terminal, then restart Finder (I like to use TinkerTool to add the "Quit" item to the Finder menu, so a simple "command-Q" will do the trick).

Now, when you QuickLook a folder, instead of a bland folder icon, you will see a motion-picture x-ray of its contents. It's more eye-candy than utility, but still. Macs are kind of both.