May 12th, 2009.
Apple releases Mac OS X 10.4.7, Security Updates 2009-002 for Mac OS X Tiger , Safari 3.2.3 and New Safari 4 Public Beta.
Safari 3.2.3 and Safari 4 Public Beta are available for Mac OS X (Leopard and Tiger) and Windows (Vista and XP).
The updates are avaialble through Apple Software Updates and Apple Support Downloads page.