Sun has released xVM Virtualbox 2.1.2.

The changelog shows a lot of
improvements. I am especially delighted to see this entry

NAT: fixed occasional crashes (bug #2709)

this one bug has really been … bugging me since it made the virtual
machine almost unusable.

Also, this release adds official support for Windows 7.

At least one defect remains. When running more than one Windows VM VirtualBox will die with the error message

An active VM already uses software virtualization. It is not allowed to simultaneously use VT-x or AMD-V.

This happens regardless of the actual setting. Only if you enable VT-x or AMD-V for all VMs they can run simutaniously..

Get it while it’s hot.