An Introduction to Virtualization
The purpose of this document can be informally stated as follows: if you were to use virtualization in a an endeavor (research or otherwise), here are some things to look at.

Swainson: Virtualization Everywhere in 5 Years
The computing resources that make the bedrock of IT will be virtualized over the next five years to alleviate the tangled Web of complexity in data centers.

Webopedia's Quick Reference: Virtualization: All About Hypervisors
As virtualization — or at least talk of it — spreads through the enterprise, the word hypervisor is popping up everywhere. To understand what a hypervisor is, you first have to have a basic understanding of system virtualization.