Tweak Leopard's Hidden Features with Secrets

There are a lot of web sites that carries Mac secrets and code to improve your OS X. The truth is, non of them come close to this web site:
secrets.textdriven.com

Here is what you need to do:

• Download and install Secrets
• Un-zip it and double click on (Secrets.prefPane)
• Run System Preferences
• On the bottom under (Other) section, you should see secrets icon. Click it
• If you are connected to the internet, secrets should automatically download secrets file
• Tweak Leopard to your liking!

For more reading about this: lifehacker.com