Yesterday Microsoft released Service Pack 1 for MOSS and WSSv3.
"For information on what's included in the service pack view the Announcing WSS 3.0 and MOSS SP1 article from TechNet. This information will be important from both a business and technical perspective to support installing SP1. The KB "Description of Windows SharePoint Services 3.0 Service Pack 1 and of Windows SharePoint Services Language Pack 3.0 Service Pack 1" in addition is a must read. It includes a link to a list of fixes included in WSS SP1. For Office SharePoint Server 2007 SP1 another KB has been posted with a downloadable Office Servers list of fixes."
Note: For SharePoint Server 2007 environments, WSS 3.0 SP1 should be installed before SharePoint Server 2007 SP1.
Download WSS 3.0 SP1
SP1 existing deployments:
Windows SharePoint Services 3.0 SP1, 32-bit edition and 64-bit edition
Windows SharePoint Services Language Pack 3.0 SP1, 32-bit edition, 64-bit edition
Download Office SharePoint Server 2007 SP1 (includes SP1 for Project Server, Forms Server, and Groove)
Office SharePoint Server 2007 SP1 32-bit edition and 64-bit edition
Office SharePoint Server 2007 Language Pack 3.0 SP1 32-bit edition, 64-bit edition
Download SharePoint Designer 2007 SP1
SharePoint Designer SP1
SharePoint Designer Language Pack SP1