Enable Xgrid sharing - allow your computer to participate in distributed computing
An introduction to the Sharing pane - enable various services and share files to other computers
How to Open the System Preferences in Mac OS X Leopard
Change the name for your computer
Connect to a network printer on your Mac.
Share your internet connect - share your Ethernet via WiFi and more with Leopard.
Allow Apple Remote Desktop administrators to connect to your computer and what they can do
Enable remote SSH login - Securely access your computer remotely
Enable Screen Sharing, allow other Leopard users to connect to your computer from other computer's over the network
Enable Web sharing, publish a website right from your own computer on Mac OSX.
See how to share your files over your network to other computers.
Share your files over your network to Windows computers
Share a printer to other devices over your network. (Mac)