Apple has updated Snow Leopard. It's recommended (if you aren't running a hackintosh with an Atom processor. It will break that.)

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 Booka
• 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: http://support.apple.com/kb/HT3874.

For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222.