Apple yesterday released Mac OS 10.6.8 and its kind of a big deal. Apple is requiring that all Macs have 10.6.8 installed before they can upgrade to Lion. Mac OS 10.7/Lion is scheduled to be released in July as a 4GB download from the Mac App Store.
Rather than installing 10.6.8 from Software Update, I recommend that you instead download and install the larger, 1.09GB "combo" updater (link updated) -- but only after fully backing up your machine and running Repair Disk Permissions in Apple's Disk Utility.
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.
Mac OS 10.7/Lion will be available next month for $29.99 for all personally registered Macs.