All the needed info can be found here: TECHNET
- Service pack fixes of Windows SharePoint Services 3.0 Service Pack 1
http://support.microsoft.com/kb/936988 - Service pack fixes of 2007 Microsoft Office servers Service Pack 1
http://support.microsoft.com/kb/936984
Great blogpost: http://blogs.msdn.com/sharepoint/archive/2007/12/11/announcing-the-release-of-wss-3-0-sp1-and-office-sharepoint-server-2007-sp1.aspx