Not only do I advocate Free/Open Source Software but I:
Teach basic computer literacy/system administration - email, Internet, applications, filesystem
Computer hardware and peripheral setup, installation and configuration
Software installation and configuration - proprietary and free/Open Source software for practically any function for your operations
Customize desktop - organize your desktop the way you work and play
Browser favorites/bookmarks/toolbar
Email address book
Desktop folders
Small office/home office setup
Extend the life of your PC - convert/upgrade to a complete Linux desktop
Establish an Internet presence - setup free web site and content management, search engine optimization