Apple has released Mac OS X 10.6.7 Snow Leopard and is available to download. You could take the Apple Software Update on your Mac system and just update to it or you can download Mac OS X 10.6.7 from the links given below and then install it on your system.
Mac OS X 10.6.7 brings in lots of fixes and improvements from the last update during January this year.
This update is recommended for all versions of Mac OS X v10.6 through 10.6.6 Snow Leopard, and includes general operating system fixes that enhance the stability, compatibility, and security of your Mac; including fixes that:
Improve the reliability of Back to My Mac.
Resolve an issue when transferring files to certain SMB servers.
Address various minor Mac App Store issues.
You can get full change log from here
Download Mac OS X 10.6.7 from here
Download Mac OS X 10.6.7 (Combo Update) from here