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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 [...]

About ProKit 7.0 (Snow Leopard 10.6.6 and later)
This ProKit Update fixes the following minor issues:

Improved support for PopOver style tooltips.
Improved support for Font Smoothing.
Addresses an issue with an unwanted gap between a menu and submenu.
Fixes leaks and improves stability for the color picker and timecode interface in Final Cut Pro and Motion.
Improved compatibility when importing [...]

The Snow Leopard Graphics Update contains stability and performance fixes for graphics applications and games in Mac OS X v10.6.4.

Addresses frame rate issues occurring in Portal and Team Fortress 2 by Valve, on iMac (Late 2009 and Mid 2010), Mac mini (Early 2009 and Mid 2010), Mac Pro (Early 2009), MacBook (Early 2009 and Mid [...]

The 10.6.4 Update is recommended for all users running Mac OS X Snow Leopard. It includes Safari 5 and general operating system fixes that enhance the stability, compatibility, and security of your Mac.
General fixes and improvements

improves compatibility with some Braille displays
resolves an issue that causes the keyboard or trackpad to become unresponsive
addresses issues copying, renaming, [...]

About the Mac OS X v10.6.3 Update
General operating system fixes and improvements provided for:

Performance of Logic Pro 9 and Main Stage 2 when running in 64-bit mode.
Printing reliability.
Sleep and wake reliability when using Bonjour wake on demand.
A color issue in iMovie with HD content.
Glowing, stuck, or dark pixels when viewing video from the iMac (Late [...]