Sun announced this week the availability of VirtualBox 3, the latest version of its open source virtualization solution. The new version introduces experimental 3D graphics support and the ability to expose multiple CPUs to guest operating systems.

VirtualBox provides relatively good integration between the guest environment and host environment. It can do clipboard and folder sharing and can dynamically adjust the guest environment display resolution as the guest window is being resized. One of its most advanced capabilities is a "seamless" mode which allows users to break the windows out of a guest environment and mix them with the windows of the host environment, similar to the Unity feature of VMware Fusion.

In VirtualBox 3, you can expose up to 32 CPUs or CPU cores to a guest environment (this requires chips that support Intel's VT-x extension or AMD-V). The VirtualBox developers have gradually been adding support for accelerated 3D graphics. VirtualBox 3 has relatively solid support for OpenGL on Windows and Linux guests.

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