* Freebies: Atomic Learning offers some free tutorials and some subscription based tutorials. One of their freebies covers Tiger (OS X 10.4). They have a series of Quicktime movies covering various aspects of Tiger. A really useful site for beginners.
* Built in Freebie: Check out the Help menu sometime - the built in help engine in OS X is really quite useful as well as user friendly.
*MLTI built in assistant: The Learning Center - you can access this either from the bookmark in Safari or from the springboard on the dock. This is a great resource on the MLTI machines.
*A non-MLTI version of the Learning Center is available online as well.