VirtualBox v4.0.0 Beta 3 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 3 Changelog:
This is the third beta of the upcoming 4.0 release. The following items were added/fixed since VirtualBox 4.0.0 Beta 2:
Solaris hosts: another fix for installing ExtPacks on Solaris
Solaris hosts: properly register mime types
GUI: fixed a crash if maximizing a guest window is not allowed
GUI: remember recent mounted mediums
GUI: fixed additions mounting
GUI: added hint how to get out of the scale mode
GUI: fixed black fullscreen minitoolbar on KDE4 hosts (bug #5449)
GUI: allow to update / downgrade / reinstall ExtPacks
3D support: fixed incorrect rendering for some d3d8/9 apps
3D support: fixed OpenGL support for 32bit apps on 64bit Windows XP SP2
3D support: fixed installation on Linux without DKMS
3D support: fixed OpenGL support for libMesa 7.9
VGA: fixed crash when booting VMs with older additions
OVA: allow individual files greater 8GB
Storage: performance optimization by not using our own block cache for read-only mediums
BIOS: implemented multi-sector reading, speeds up booting of certain guests (e.g. Solaris)
VMM: fixed FreeBSD 8.1 boot hang for unrestricted guest execution with VT-x
VMM: fixed performance regression for 32-bit SMP guests (VT-x + nested paging)
VMM: fixed performance regression (VT-x with preemption timer only)
VMM: improved fix for blocking NMIs triggered by active performance counters (Linux hosts in non-VT-x/AMD-V mode only; bug #7819)
User Manual: Windows help file (.chm) is searchable again
Windows Additions: fixed Windows 2000 guests (4.0.0 Beta 1 regression)
Solaris Additions: fixed guest X11 drivers
Solaris Additions: fixed unexpected termination of VBoxService
Linux Additions: fixed xorg.conf patching for older Linux (3.2.12 regression)

Download: VirtualBox v4.0.0 Beta 3
Source: Here