Microsoft has released service pack 3 for SharePoint 2007 (MOSS) and WSS 3.0 which is likely the last service pack for these products before their end of support. To read more about service pack 3 for the Office 2007 and SharePoint 2007 products go to the Microsoft Office Blog here. To download service pack 3 for Office 2007 and SharePoint 2007 products (and WSS 3.0) go to the Microsoft Office Blog here. As with any newly released updates it is recommended to test these on a staging system prior to installing these service pack on a production farm.