has been in beta
for less than a month, but Sun Microsystems has now decided to officially release this major update to their virtualization software. Most notably, VirtualBox 3.0 finally brings support for SMP (Symmetric Multi-Processing) to guest operating systems. In addition, guest operating systems running with VirtualBox 3.0 are now able to access OpenGL 2.0 support with hardware acceleration on supported hardware / drivers.
Beyond the improved 3D graphics support and the long-awaited SMP support VirtualBox 3.0 also brings a variety of fixes and other improvements across the board. The VirtualBox change-log is available via their Wiki
The VirtualBox 3.0 release announcement can be read on vbox-announce