The 10.6.8 update is 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, including fixes that:
– Enhance the Mac App Store to get your Mac ready to upgrade to Mac OS X Lion
– Resolve an issue that may cause Preview to unexpectedly quit
– Improve support for IPv6
– Improve VPN reliability
– Identify and remove known variants of Mac Defender
For detailed information on this update, please visit this website: http://support.apple.com/kb/HT4561.
For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222.
Update:
Direct links for the various downloads on Apple’s support pages include:
Download Mac OS X 10.6.8 Update (474.2 MB)
Download Mac OS X 10.6.8 Update Combo (1.09 GB)
Download Mac OS X Server v10.6.8 Update (542 MB)
Download Mac OS X Server v10.6.8 Update Combo (1.27 GB)
Download Security Update 2011-004 (Leopard) (256.4 MB)
Download Security Update 2011-004 (Leopard Server) (499.8 MB)
Download Server Admin Tools 10.6.8 (255.9 MB)