The opposite of virtual is real, absolute, or physical.

System x3650 M2 Server - Read Study about IBM Servers with Intel® Xeon® Processor 5500 Series

Windows Server® 2008 R2 - Free Download - Reduce Costs & Increase Efficiencies Across Your Enterprise. Download Today!

AT&T Enterprise Solutions - AT&T's Enterprise Application Hosting: Reliable, Cost Effective.

InfoSpace project 
Outline of a paper describing the InfoSpace project. InfoSpace is a model that combines a three-dimensional visual interface with a three-dimensional virtual environment to create a new mode of data organization and human/information interaction.

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.

Open Networks Today
Networking news moves at a fast pace, and Open Networks Today lets you keep up with it. Open Networks Today offers its readers the ability to control how news is presented through customizing content filters, discussions, and news feed links.

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.