SP3 for SharePoint 2007 has been released. The October CU has been released as well. It’s a good idea to install the October CU(or later) and SP3 at the same time.
More information can be found in the following articles:
· Announcing Service Pack 3 for Office 2007 and SharePoint 2007
· Description of the 2007 Office suite SP3 and of Office Language Pack 2007 SP3
· Technical details about the 2007 Office system SP3 releases
· Technical details about the Windows SharePoint Services 3.0 SP3 releases
· Technical details about the 2007 Office Servers SP3 releases