Microsoft has just release Service Pack 3 for SPS2003 and WSSv2.
Microsoft Windows SharePoint Services Service Pack 3 (SP3) contains stability improvements and performance improvements. Some fixes that are included with Windows SharePoint Services SP3 were previously released in separate updates. Windows SharePoint Services SP3 combines the previously released fixes into one update.
Microsoft Office SharePoint Portal Server 2003 Service Pack 3 (SP3) contains significant security improvements. Some fixes that are included in SharePoint Portal Server 2003 SP3 were previously released as separate updates. This service pack combines these updates into one update.