If you have a PartnerSource account you can download it from this page.
The text below is from the description:
The Microsoft Dynamics Partner Instant Update Screensaver gives you the opportunity to get updates on an ongoing basis from the global Microsoft Dynamics Product Management teams. It offers you the opportunity to get global updates directly to your desktop. The news column in the left hand side of the screensaver is updated with new announcements on an ongoing basis and links to the full details on PartnerSource. Once installed, news updates will be fed automatically to your screen whenever you are online and the screensaver is activated.
Install the screensaver on your machine and specify your preferences using "settings" in the top right corner of the screensaver.