[via Office Sustained Engineering and Release team]
We are pleased to announce the availability of Service Pack 3 (SP3) for our 2007 family of products. This service pack contains all the Cumulative Updates and Public Updates for Office 2007 that have shipped since SP2 for both the Office client suites and applications, and the SharePoint server applications. The Project Server updates are included along with the SharePoint updates in the Office Servers SP3 updates. SP3 also contains additional new fixes which are described here. For a list of changes for each product, please refer to their individual KBs. The KB Articles referenced below will be updated throughout the day to include the live links to the published articles. Starting today, SP3 is available from the Download center. The Downloads Table below provides links to the new packages for SP3. If you have installed all Office Automatic Updates, you will also see SP3 available as a manual download from Microsoft Update. After a 90 day period, SP3 will be offered as an automatic update through Microsoft Update.
More details here.
For your convenience here are the direct download links to the service packs:
As usual you have to install as well the service pack for the core product and for all installed language packs.