VirtualBox v4.0.0 Beta 2 is released. VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox v4.0.0 Beta 2 Changelog:
This is the second beta of the upcoming 4.0 release. The following items were added/fixed since VirtualBox 4.0.0 Beta 1:
ExtPacks: show a confirmation dialog before installing an extpack
ICH9 chipset: fix Windows detection of the 82801IB host bridge
Linux hosts: fixed a wrong dependency to libstdc++5 in the Oracle
ExtPack for 32-bit Linux which prevented to install that package on recent Linux distributions
Solaris hosts: fixed a bug which prevented to install ExtPacks at all
Linux/Solaris hosts: fixed the changelog in VirtualBox.chm (4.0 Beta 1 regression)
Audio/HDA: fixed issue with Ubuntu 10.10 guests and OpenSolaris guests
Audio/HDA: fixed choppy sound of Windows guests
GUI: fixed display of the file shortcuts on some older Window Manager on X11
Mouse: fixed mouse reporting which was not working for X11 guests with pre-4.0 Additions (4.0 Beta 1 regression)
Settings: use forward slashes in paths to make settings files more portable between Windows & other platforms
VBoxManage: show exact image format variant with VBoxManage showhdinfo
VBoxHeadless: detect VBoxSVC crash and terminate the VM cleanly
SATA: fixed DVD detection with Solaris guests
Linux Additions: fixed compilation of the kernel modules with DKMS (4.0 Beta 1 regression)
VMDK: fixed image corruption with async I/O (4.0 Beta 1 regression)
VBoxManage: fixed image resizing and the associated help text
OVA: fix wrong size writing for individual files greater 4GB (max. 8GB now)
X11 guests: multi-monitor support for X.Org Server 1.3+


Download: VirtualBox v4.0.0 Beta 2
Source: Here