* Solaris hosts: allow suspend/resume on the host when a VM is running (bug #3826)
* Solaris hosts: loosen the restriction for contiguous physical memory under certain conditions
* Mac OS X hosts: fixed guest PAE
* Linux hosts: kernel module compile fixes for 2.6.31 (bug #4264)
* VMM: fixed occasional guru meditation when loading a saved state (VT-x only)
* VMM: eliminated IO-APIC overhead with 32 bits guests (VT-x only, some Intel CPUs don’t support this feature (most do); bug #638)
* VMM: fixed 64 bits CentOS guest hangs during early boot (AMD-V only; bug #3927)
* VMM: performance improvements for certain PAE guests (e.g. Linux 2.6.29+ kernels)
* VMM: some Windows guests detected a completely wrong CPU frequency (bug #2227)
* VMM: fixed hanging and unkillable VM processes (bug #4040)
* VMM: fixed random infrequent guest crashes due to XMM state corruption (Win64 hosts only)
* VMM: performance improvements for network I/O (VT-x/AMD-V only)
* GUI: added mini toolbar for fullscreen and seamless mode (Thanks to Huihong Luo)
* GUI: redesigned settings dialogs
* GUI: allow to create/remove more than one host-only network adapters (non Windows hosts)
* GUI: display estimated time for long running operations (e.g. OVF import/export)
* GUI: fixed rare hangs when open the OVF import/export wizards (bug #4157)
* 3D support: fixed VM crashes for client applications using incorrect OpenGL states
* 3D support: fixed memory corruption when querying for supported texture compression formats
* 3D support: fixed incorrect rendering of glDrawRangeElements
* 3D support: fixed memory leak when using VBOs
* 3D support: fixed glew library detection
* 3D support: fixed random textures corruption
* VRDP: support Windows 7 RDP client
* Networking: fixed another problem with TX checksum offloading with Linux kernels up to version 2.6.18
* NAT: fixed “open ports on virtual router 10.0.2.2 - 513, 514” (forum)
* NAT: allow to configure socket and internal parameters
* NAT: allow to bind sockets to specific interface
* PXE boot: significant performance increase (VT-x/AMD-V only)
* VHD: properly write empty sectors when cloning of VHD images (bug #4080)
* VHD: fixed crash when discarding snapshots of a VHD image
* VHD: fixed access beyond the block bitmap which could lead to arbitrary crashes
* VBoxManage: fixed incorrect partition table processing when creating VMDK files giving raw partition access (bug #3510)
* VBoxManage: support cloning to existing image file
* OVF: several OVF 1.0 compatibility fixes
* OVF: fixed exporting of disk images when multiple virtual machines are exported at once
* Virtual mouse device: eliminated micro-movements of the virtual mouse which were confusing some applications (bug #3782)
* Shared Folders: sometimes a file was created using the wrong permissions (2.2.0 regression; bug #3785)
* Shared Folders: allow to change file attributes from Linux guests and use the correct file mode when creating files
* Shared Folders: some content was incorrectly written under certain conditions (bug #1187)
* Shared Folders: fixed incorrect file timestamps, when using Windows guest on a Linux host (bug #3404)
* X11 clipboard: fix duplicate end of lines (bug #4270)
* X11 guests: a number of shared clipboard fixes
* Linux guests: Guest Additions support for SUSE Linux Enterprise Desktop 11
* Linux guests: new daemon vboxadd-service to handle time synchronization and guest property lookup
* Linux guests: implemented guest properties (OS info, logged in users, basic network information)
* Windows host installer: VirtualBox Python API can now be installed automatically (requires Python and Win32 Extensions installed)
* USB: Support for high-speed isochronous endpoints has been added. In addition, read-ahead buffering is performed for input endpoints (currently Linux hosts only). This should allow additional devices to work, notably webcams (bug #242).
* USB: fixed error handling for some USB dongles
* Web service: fixed inability to handle NULL pointers for object arguments, which are valid values for a lot of APIs, in both the raw and the object-oriented web service.
* Web service: object-oriented bindings for JAX-WS did not exhibit interface inheritance correctly, fixed
* Web service: added support for IDisplay and IGuest interfaces, which were previously unavailable
* Registration dialog uses Sun Online accounts now