Hi, my name is Joel Schaeffer, and I am an Escalation Engineer on the Platforms Global Escalation Services (GES) team. I created a video to discuss the August 2007 Windows Cumulative Time Zone Update. It is hosted on Channel9, and can be found here. It will explain how to install the patch, validate the install, manually update non-mainstream Windows versions, and how to update Windows Mobile clients.
See the following knowledge base articles for more information about how to update time zone information on your Windows clients and servers:
August 2007 cumulative time zone update for Microsoft Windows operating systems
How to configure daylight saving time for Microsoft Windows operating systems
An August 2007 daylight saving time update for Windows Mobile-based devices is available
See http://www.microsoft.com/dst2007 for more details about how to prepare for the upcoming DST changes for all Microsoft products.