VMware Released VMware Server 2 and its a free Download

VMware Server 2 is now available for download-free. Here are some of the features:

• A new Web-based management console for simple, more flexible administration, with the ability to create customized remote console URLs for virtual machine users.
• Expanded support for several additional operating systems, including Microsoft Windows Vista, Windows Server 2008, Red Hat Enterprise Linux 5 and Ubuntu 7.x.
• Improved performance with support for up to 8GB of RAM, 64-bit guest operating systems, high-speed USB devices, and 2-way symmetric multiprocessing (SMP).
• Support for Volume Shadow Copy Service (VSS) to back up the state of the virtual machine when using the Snaphot functionality and maintain application data integrity.

You can read more about it and download the software here