* 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

In addition, the following items were ?xed and/or added:

* GUI: added accessibility support (508)
* GUI: VM session information dialog
* VBoxHeadless: renamed from VBoxVRDP
* VMM: reduced host CPU load of idle guests
* VMM: many ?xes for VT-x/SVM hardware-supported virtualization
* ATA/IDE: better disk geometry compatibility with VMware images
* ATA/IDE: virtualize an AHCI controller
* Storage: better write optimization, prevent images from growing unnecessarily.
* Network: support PXE booting with NAT
* Network: ?xed the Am79C973 PCNet emulation for Nexenta guests
* NAT: improved builtin DHCP server (implemented DHCPNAK response)
* NAT: port forwarding stopped when restoring the VM from a saved state
* NAT: make subnet con?gurable
* XPCOM: moved to libxml2
* XPCOM: ?xed VBoxSVC autostart race
* Audio: SoundBlaster 16 emulation
* USB: ?xed problems with USB 2.0 devices
* MacOS X: ?xed seamless mode
* MacOS X: better desktop integration, several look’n’feel ?xes
* MacOS X: switched to Quartz2D framebuffer
* MacOS X: added support for shared folders
* MacOS X: added support for clipboard integration
* Solaris: added host audio playback support (experimental)
* Solaris: made it possible to run VirtualBox from non-global zones
* Shared Folders: made them work for NT4 guests
* Shared Folders: many bug?xes to improve stability
* Seamless windows: added support for Linux guests
* Linux installer: support DKMS for compiling the kernel module
* Linux host: compatibility ?xes with Linux 2.6.25
* Windows host: support for USB devices has been signi?cantly improved; many additional USB devices now work
* Windows Additions: automatically install AMD PCNet drivers on Vista guests
* Linux additions: several ?xes, experimental support for RandR 1.2
* Linux additions: compatibility ?xes with Linux 2.6.25