The Safari 5.0.4 update improves:

- Stability for webpages with multiple instances of plug-in content.

- Compatibility with webpages with image reflections and transition effects.

- A fix for an issue that could cause some webpages to print with incorrect layouts.

- A fix for an issue that could cause content to display incorrectly on webpages with plug-ins.

- A fix for an issue that could cause a Screen Saver to appear while video is playing in Safari.

- Compatibility with VoiceOver on webpages with text input areas and lists with selectable items.

- Stability when using VoiceOver.

Visit the Apple website for more information.