The 10.6.3 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:

improve the reliability and compatibility of QuickTime X
address compatibility issues with OpenGL-based applications
address an issue that causes background message colors to display incorrectly [...]

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This is Information from Software Update.For Safari users, please take note some improvement.SO for those who already fed-up with their web browser, you might want to try out Safari new version 4.0.5.
This update is recommended for all Safari users and includes improvements to performance, stability, and security including:
Performance improvements for Top Sites
Stability improvements for 3rd-party [...]

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