Transitioning from a PC to Mac
Apple Mac OS X Introduction: Transition from Windows 7
Attendees will learn how to use the basic Mac Operating System (OS) functions including exploring the desktop interface, running applications, managing files and customizing the OS.
Manuals & Guides
Video Tutorials from Apple: Anatomy of a Mac, Windows on a Mac, PC to Mac-The Basics, Wireless Basics, iChat Basics, Mail Basics
Mouse Preferences has demos on shortcuts to the track pad.
Also see the Keyboard Preferences for making your own key combinations.