• 64 bits guest support (64 bits host only)
• New native Leopard user interface on Mac OS X hosts
• The GUI was converted from Qt3 to Qt4 with many visual improvements
• New-version notifier
• Guest property information interface
• Host Interface Networking on Mac OS X hosts
• New Host Interface Networking on Solaris hosts
• Support for Nested Paging on modern AMD CPUs (major performance gain)
• Framework for collecting performance and resource usage data (metrics)
• Added SATA asynchronous IO (NCQ: Native Command Queuing) when accessing raw disks/partitions (major performance gain)
• Clipboard integration for OS/2 Guests
• Created separate SDK component featuring a new Python programming interface on Linux and Solaris hosts
• Support for VHD disk images

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

• VMM: VT-x fixes
• AHCI/SATA: improved performance
• GUI: keyboard fixes
• Linux installer: properly uninstall the package even if unregistering the DKMS module fails
• Linux additions: the guest screen resolution is properly restored
• Network: added support for jumbo frames (> 1536 bytes)
• Shared Folders: fixed guest crash with Windows Media Player 11
• Mac OS X: Ctrl+Left mouse click doesn’t simulate a right mouse click in the guest anymore. Use Hostkey+Left for a right mouse click emulation. (bug #1766)