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The 10.6.2 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 for:

an issue that might cause your system to logout unexpectedly
a graphics distortion in Safari Top Sites
Spotlight search results not showing Exchange contacts
a problem that prevented authenticating as an administrative user
issues when using NTFS and WebDAV file servers
the reliability of menu extras
an issue with the 4-finger swipe gesture
an issue that causes Mail to quit unexpectedly when setting up an Exchange server
Address Book becoming unresponsive when editing
a problem adding images to contacts in Address Book
an issue that prevented opening files downloaded from the Internet
Safari plug-in reliability
general reliability improvements for iWork, iLife, Aperture, Final Cut Studio, MobileMe, and iDisk
an issue that caused data to be deleted when using a guest account


For detailed information on this update, please visit this website: About the Mac OS X v10.6.2 Update.
For information on the security content of this update, please visit: Apple security updates.

Source: Auto Update