Forefront Security for SharePoint has been renamed to Forefront Protection 2010 for SharePoint.
Listed below is the overview and new features of the product:
“Microsoft Forefront Protection 2010 for SharePoint helps prevents users from uploading or downloading documents containing malware, out-of-policy content, or sensitive information to SharePoint libraries. Using multiple antimalware scanning engines from industry-leading security partners combined with file and keyword filtering, Forefront Protection 2010 for SharePoint provides comprehensive protection against the latest threats. The product integrates with SharePoint technologies to provide high performance, easily customized protection optimized for SharePoint collaboration environments.”
Read more on the new Forefront Threat Management Gateway 2010