We are happy to announce that December Cumulative Update for Office SharePoint Server 2007 and Windows SharePoint Services 3.0 is available now. Despite the fixes and improvements, this new update package is also an effort to create a more convenient way for SharePoint administrators to keep all files in their SharePoint installations up-to-date. In this post, we will guide you on how and when to update, and the background of this new update model improvement.
Source : blogs.msdn.com/sharepoint