1.6.6 and 2.0.0 released, and still at 1.6.2 in ubuntu / debian... Perhaps this bug should be related to the debian archive as well? 

From http://virtualbox.org/wiki/Changelog :

VirtualBox 2.0.0 (released 2008-09-04)

This version is a major update. The following major new features were added:

    * 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) 

VirtualBox 1.6.6 (released 2008-08-26)

This is a maintenance release. The following items were fixed and/or added:

    * VMM: fixed excessive logging (bug #1901)
    * VMM: AMD-V stability fixes (bug #1685)
    * GUI: added support for Ctrl+Caps reversed keyboards (bug #1891)
    * SATA: fixed BSODs of Windows guests on a SATA disk (bug #1941)
    * SATA: fixed hard disk detection on Solaris 10 U5 (bug #1789)
    * VBoxHeadless: don’t start the clipboard service (bug #1743)
    * VBoxHeadless: added -vrdp parameter which allows to start the VM session without VRDP (bug #1960)
    * VBoxManage: fixes to creating raw disk/partition VMDK files, now accepts removable media on Windows (bug #1869)
    * VRDP: fixed communication with MS Remote Desktop Connection on Mac OS X (bug #1337)
    * VRDP: clipboard fixes (bug #1410)
    * VRDP: fixed crash during PAM authentication (bug #1953)
    * Shared Folders: fixed a regression introduced in version 1.6.2: the shared folders service was sometimes not properly installed (Windows guests only, bug #1915)
    * Shared Folders: don’t deny to load a VM if a shared folder is not accessible (bug #822)
    * BIOS: allow to specify empty DMI strings (bug #1957)
    * OSE archive: added missing Makefiles (bug #1912)
    * Linux hosts: workaround for buggy gcc-4.3 compilers (e.g. openSUSE 11)
    * Linux hosts: one more fix for compiling the kernel modules on Linux 2.6.27 (bug #1962)
    * Mac OS X hosts: shared folders unicode fix
    * Solaris hosts: fixed link issue (bug #1840)
    * Windows additions: allow to downgrade the package
    * Windows additions: fixed corrupted installer icon on Windows 2000 (bug #1486)
    * Windows additions: fixed bug when creating intermediate directories (bug #1870)
    * Windows additions: implemented /xres=, /yres= and /depth= switches for the installer (bug #1990)
    * Linux additions: properly unregister the misc device when unloading the kernel module
    * Linux additions: fixed startup order for recent Linux distributions again (e.g. openSUSE 11)
    * Linux additions: attempt to fix the autostart issue of !VBoxClient with Mandriva guests (bug #1699)
    * Linux additions: fixed detection of patched Linux 2.6.18 kernels of RHEL5 / FC6 / CentOS 5.2 (bugs #1899, #1973)
    * Linux additions: added new mount flags dmode, fmode, umask, dmask and fmask allowing to override the file mode (bug #1776)
    * Documentation: added a note that jumbo frames don’t work (bug #1877)
    * Documentation: document special host interface names on openSUSE11 (bug #1892)