As I announced in my previous blog item Microsoft released the Office 2007 Service Packs (Both for client and server software) December 11 2007.

If you go to the Microsoft Download site you can find all installers available:

http://www.microsoft.com/downloads/results.aspx?freetext=%22Office%202007%22%20SP1&productID=&categoryId=&period=&sortCriteria=date&nr=20&DisplayLang=en

Among others there are: 

The 2007 Microsoft Office Suite Service Pack 1 (SP1)
and
The 2007 Microsoft Office Servers Service Pack 1 (SP1)

Have fun!