Microsoft® Internet Security and Acceleration (ISA) Server 2006 Service Pack (SP) 1 will be available for your installation pleasure this summer!
This Service Pack introduces new features and improved functionality for ISA Server 2006 Enterprise and Standard Editions. The new features focus primarily on enhanced troubleshooting mechanisms designed to help you identify and resolve ISA Server configuration issues. Also included in this package are the updates we’ve promised for so long, such as SAN certificate support.
Read more here.