A look at the Activity Monitor and why its helpful and more powerful than the Force Quit Menu
Join a Hidden Wireless Network
Join a wireless network that is hidden in Leopard.
Keyboard shortcuts for use in Dashboard
Define words on the fly in OSX
Create a Password Protected Disk Image
Create a disk image which is password protected
Securely erase a disk using Disk Utility
Adding bookmarks to DVDs you're watching
Zoom into the DVD you're watching - make the video take up the entire screen
IF you want to lock the computer, you can enable a menu bar icon allowing you to do so
While in full screen mode, use the fill screen button to make the video take up the entire screen, no black bars
How to browse the web "privately"
How to use the Auto Fill feature
How to create web clips for use in your Dashboard