Apple has released Safari 5.0.3 for Mac OS X Leopard (10.5) and Snow Leopard (10.6.x) and Windows, as well as Safari 4.1.3 for Mac OS X Tiger. The update brings a slew of security enhancements as well as some general improvements.
This update contains improvements to usability, compatibility, stability, accessibility and security, including the following:
More accurate Top Hit results in the Address Field
More accurate results in Top Sites
Fixes an issue that could cause content delivered with the Flash 10.1 plug-in to overlap webpage content
More reliable pop-up blocking
Improved stability when typing into search and text input fields on www.netflix.com and www.facebook.com
Improved stability when using JavaScript-intensive extensions
Improved stability when using VoiceOver with Safari
For detailed information on the security content of this update, please visit this site: http://support.apple.com/kb/HT1222
Safari 5 can be downloaded from http://www.apple.com/safari/ .
UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.12) Gecko/20101026 AlexaToolbar/alxf-2.0 Firefox/3.6.12

