The latest version of Mac OS X Snow Leopard 10.6.8 has been released, just before the impending lauch of OX X Lion due in July. 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