Leopard’s built-in screen sharing is fantastic as long as you are going between Mac Leopard machines. For older Mac OS X versions, and for connecting to Windows machines, you’ll want to get Chicken of the VNC I know the name sounds cheesy, but this open source and free VNC client will allow you to view the screen of any machine that has a standard VNC server running, or even a Mac OS X Tiger machine with VNC functionality turned on.
Related: Forgot iMac G3 Admin/Login Password, Time Machine Editor – not overwriting old files when destination disk is full, Upgrade to Lion Server or not?, External drive encryption with OSX 10.7 (LION), Nambu.
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