SPS SP 2 has been released. SPS can now:
Support for running on 64-bit machines in 32-bit emulation mode
Support for Reverse Proxy and Alternate URL support
Support for IP-Bound virtual servers
Support for off-box SSL termination
Support for SQL Server 2005
Kerberos-enabled by default
NOTE: Before you install SharePoint Portal Server 2003 SP2 on a computer that is running Microsoft Windows Server 2003 x64 Edition, see the following article in the Microsoft Knowledge Base:
905854 (http://support.microsoft.com/kb/905854/) Prerequisites information for installing SharePoint Portal Server 2003 Service Pack 2 on a computer that is running Windows Server 2003 x64 Edition