Office 2007 Service Pack 1 (SP1) Now Available
You can now download the just released Office 2007 SP1. Get more information from Description of the 2007 Microsoft Office suite Service Pack 1.
I recommend you go to the Microsoft Update site to get all updates required for Windows, IE, and all Office versions, as MS has today also released a swathe of updates for Windows, IE, and other Office versions.
Also Secunia Site Inspector will provide direct links to security updates it identifies as being needed.