Shame on me, not visiting VirtualBox for long time make my mind make tiny error in making conclusion. This project is dead.

I’m totally wrong of course

VirtualBox 1.6 already released.

Click here to download

Some interesting feature in VirtualBox after acquisition by Sun :

• Solaris and Mac OS X host support
• Seamless windowing for Linux and Solaris guests
• Guest Additions for Solaris
• A webservice API
• SATA hard disk (AHCI) controller
• Experimental Physical Address Extension (PAE) support

Microsoft has Virtual Machine, Sun has VirtualBox