Safari 3.1.2 for Windows was released to address;

CVE-ID: CVE-2008-1573
Available for: Windows XP or Vista
Impact: Viewing a maliciously crafted BMP or GIF image may lead to information disclosure

CVE-ID: CVE-2008-2540
Available for: Windows XP or Vista
Impact: Saving untrusted files to the Windows desktop may lead to the execution of arbitrary code

CVE-ID: CVE-2008-2306
Available for: Windows XP or Vista
Impact: Visiting a malicious website which is in a trusted Internet Explorer zone may lead to the automatic execution of arbitrary code

From - "About the security content of Safari 3.1.2 for Windows"

Safari 3.1.2 for Windows - "This update is recommended for all Safari Windows users and includes stability improvements and the latest security updates".

Thanks to all of the folks that submitted links!