Apple has released Mac OS X 10.6.4. It’s a 315.5MB download. You can obtain it via the Software Updates component of the Mac OS X System Preferences app.
According to Apple’s release notes, Mac OS X 10.6.4 includes Safari 5 and general operating system fixes that enhance the stability, compatibility, and security of your Mac, including fixes that:
° Resolve an issue that causes the keyboard or trackpad to become unresponsive;
° Resolve an issue that may prevent some Adobe Creative Suite 3 applications from opening;
° Address issues copying, renaming, or deleting files on SMB file servers;
° Improve reliability of VPN connections;
° Resolve a playback issue in DVD Player when using Good Quality deinterlacing;
° Resolve an issue editing photos with iPhoto or Aperture in full screen view;
° Improve compatibility with some braille displays.