http://www.macrumors.com/2008/06/19/apple-addresses-security-issue-in-safari-3-1-2-for-windows/
Apple released a new version of Safari for Windows today. Version 3.1.2 is recommended for all Safari Windows users and includes stability improvements and the latest security updates.
Computerworld reports that the new version of Safari for Windows provides a fix for a possible "carpet bomb" issue that was described by Nitesh Dhanjani in May. This exploit alone was considered a nuisance by itself, but combined with other flaws in Windows and Internet Explorer could have resulted in a security risk.
This latest update appears to address this and other security issues for Safari for Windows users.