DevX just published a great, extended report on virtualization focused on development and testing.

Here the whole list of articles:

• Virtual Machines Usher In a New Era
  Recognizing the impact virtual machines can have on the application development process, DevX has compiled a comprehensive special report that helps you understand and evaluate the available virtualization solutions and guides you through deployment.
• A Developer’s Eye View of Virtual Machines
  Virtualization technology allows developers to create multiple virtual testing and development environments on a single physical machine. The cost-saving implications are just the beginning of the story.
• The Right and Wrong Virtual Machine Uses in Development and Testing
  As much time and money as virtual machines can save you in your software development and testing processes, they’re not the right choice for every scenario.
• The Pros and Cons of Virtual Machines in the Datacenter
  Think implementing virtual machine technology in your datacenter is a no-brainer? Think again. You’ll need to determine whether the VM benefits outweigh the drawbacks for your particular environment.
• The Developer’s Guide to Building Virtual PCs
  Walk through a step-by-step Microsoft Virtual PC 2004 installation of SuSE Linux 9.1 Professional. Once it’s built, you can clone your Virtual PC, back it up, perform experiments on it, restore it, and even distribute it to others.
• Prototype Complex Enterprise Solutions with Just Your Workstation
  Before embarking on a hardware purchasing spree to prototype and test that clustered backend solution you’re planning, learn how virtualization enables you to build a prototype right on your desktop.
• Make A Virtual Machine Your Safe Internet-Browsing Sandbox
  Browsing unknown Web sites puts your system at risk for malware infection. Using a virtual machine as a sandbox for safer browsing provides an additional layer of security for your machine.
• Keys to a Successful Virtual Infrastructure Implementation
  A senior systems engineer who oversaw his organization’s virtual infrastructure deployment has some valuable advice for those ready to make the VM leap.
• Virtual Machines: A Logical Evolution of Operating Systems
  The same properties that made virtual machines (VMs) on IBM mainframes indispensable in the 1960’s will eventually make VMs indispensable on today’s servers and desktop machines. But as of today, they still have some evolving to do.