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, including fixes that:
- resolve an issue that causes the keyboard or trackpad to become unresponsive
- resolve an issue that may prevent some Adobe Creative Suite 3 applications from opening
- address issues copying, renaming, or deleting files on SMB file servers
- improve reliability of VPN connections
- resolve a playback issue in DVD Player when using Good Quality deinterlacing
- resolve an issue editing photos with iPhoto or Aperture in full screen view
- improve compatibility with some braille displays
However this 10.6.4 update will cause [Hackintosh] kernal panic on reboot if you forget to remove file SleepEnabler.kext from/Extra/Extensions/.
Solution for solve kernal panic :
- Booted OSX 10.6 Retail DVD with Empire-EFI, mounted hackintosh system partition, removed file SleepEnabler.kext from /Extra/Extensions/
or
- Or if you dual-boot with windows Then you can use MacDrive to access MAC System Partitions. [DOWNLOAD]
//After install MacDrive then go to Mac Partition *eg: G:\System\Library\Extensions and delete SleepEnabler.kext* reboot your pc and enjoy the 10.6.4 update!

