Microsoft has released an ISO image with the December 2008 security updates

This DVD5 ISO image file contains the security updates for Windows released on Windows Update on December 9th, 2008. The image does not contain security updates for other Microsoft products. This DVD5 ISO image is intended for administrators that need to download multiple individual language versions of each security update and that do not use an automated solution such as Windows Server Update Services (WSUS). You can use this ISO image to download multiple updates in all languages at the same time.

Microsoft December 2008 Security Release ISO Image