Apple has released Mac OS X 10.6.8 (http://support.apple.com/kb/HT4561). It’s recommended for all users running Mac OS X Snow Leopard and includes general operating system fixes that enhance the stability, compatibility, and security of your Mac.
Apple also released the 10.6.8 update for Mac OS X Snow Leopard Server (http://support.apple.com/kb/HT4560). You can obtain the updates via the Software Updates component of the Mac OS X Systems Preferences app.