VirtualBox 3.2 beta adds official support for OS X VMs -- sorta
Don't get too excited just yet, though.
While the operating system is listed as a guest OS type in VirtualBox on all platforms, it's only working on Mac hardware. Still, for Mac users who have been waiting to be able to easily virtualize additional OS X desktops on their systems, VBox 3.2 should work nicely. The rest of us can, of course, get an OS X guest working with some additional hacking -- that's been possible for a while now.
Download VirtualBox 3.2 beta 1 and take it for a spin!