Unquarantine - Remove the annoying quarantine warning from your Leopard-powered Mac
Version:Unquarantine gets rid of Leopard's annoying "this application was downloaded from the Internet" warnings by stripping the "quarantine" property.
Operating System: Mac OS X
All you will have to do is to copy the Unquarantine.scpt in ~/Library/Scripts/Folder Action Scripts. In case that folder does not exist on your Mac you will need to create the Scripts directory and its subdirectory.
Afterwards go to ~/Downloads (or wherever your downloads go). Right-click on that folder, navigate to More > Configure Folder Actions. Here just check "Enable Folder Actions" and attach the "Unquarantine" action to the folder.
Unquarantine is a Folder Action that will automatically be triggered whenever items are added to the attached folder.