You can download the binaries here.
Version 2.2.0 will be a major update. The following items were added / fixed since VirtualBox 2.2.0 Beta 1:
- Raised the memory limit for VMs on 64-bit hosts to 16GB
- Many fixes for OVF import/export
- VMM: properly emulate RDMSR from the TSC MSR, should fix some NetBSD guests
- IDE: fixed hard disk upgrade from XML-1.2 settings (bug #1518)
- Hard disks: refuse to start the VM if a disk image is not writable
- USB: Fixed BSOD on the host with certain USB devices (Windows hosts only; bug #1654)
- E1000: properly handle cable disconnects (bug #3421)
- X11 guests: prevented setting the locale in vboxmouse, as this caused problems with Turkish locales (bug #3563)
- Linux additions: fixed typo when detecting Xorg 1.6 (bug #3555)
- Windows guests: bind the VBoxMouse.sys filter driver to the correct guest pointing device (bug #1324)
- Windows hosts: fixed BSOD when starting a VM with enabled host interface (bug #3414)
- Linux hosts: do not leave zombies of VBoxSysInfo.sh (bug #3586)
- VBoxManage: controlvm dvdattach did not work if the image was attached before
- VBoxManage showvminfo: don't spam the release log if the additions don't support statistics information (bug #3457)
- GUI: fail with an appropriate error message when trying to boot a read-only disk image (bug #1745)
- LsiLogic: fixed problems with Solaris guests
