Here it is folks, the main reason to keep up with the service pack for SharePoint so you can migrate to the next version v3 whenever that's ready.

Service Pack 2 for SharePoint Portal Server 2003 has been made available from the Download Center

SP2 introduces support for the following:

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

Lastly, SharePoint Portal Server 2003 with SP2 will be Kerberos-enabled by default.