Explaining Virtualization with the example of Virtual PC software

Here's a presentation that will explain what is the traditional hardware, what is the need to have virtualization, how memory,CPU and disk I/O is handled in a virtualized environment , what is a hypervisor, how virtualization address today IT concerns and many more basic concepts of virtualization technology.
Before you read ahead, read this "Simple Meaning of Virtualization"

Lets see if you are getting a grip of what you just read . Mention top 5 reasons to adopt virtualization software ? Answer it in the below comments section.
If you have concerns or question, send me an email on :  piyush@pcclm.com