苹果今天宣布了Mac OS X Snow Leopard 10.6.4版本，这个300-640MB容量的更新已经可以在软件更新功能中下载到。
新版系统更新Safari浏览器到版本5，并提供了大量系统改良，以下是更新列表：

General fixes and improvements

-improves compatibility with some Braille displays
-resolves an issue that causes the keyboard or trackpad to become unresponsive
-resolves an issue that may prevent some Adobe Creative Suite 3 applications from opening
-addresses issues copying, renaming, or deleting files on SMB file servers
-improves reliability of VPN connections
-resolves a playback issue in DVD Player when using Good Quality deinterlacing
-resolves an issue editing photos with iPhoto or Aperture in full screen view
-resolves an issue with Parental Controls Time Limits for Open Directory or Active Directory users
-resolves a display sleep issue with MacBook Pro (Early 2010) computers
-resolves an issue with MacBook Pro (Early 2010) computers in which the right speaker may sound louder -than the left speaker
-includes Safari 5.0; for more information about Safari 5.0, see this webpage
-Security improvements; for information about the security content of this update, please visit this article
-Fixes and improvements for Aperture 3

-adds tethered shooting support for additional digital camera models
-addresses IPTC metadata compatibility issues
-Fixes and improvements for external devices

-RAW image compatibility for additional digital cameras
-resolves an issue with using third-party USB web cameras
-resolves an issue with noise when using some third-party FireWire audio devices
-resolves pairing issues with Apple remotes