Thanks to a note from the hard working folks in Windows Sustained Engineering (!), I'm happy to announce that the 2008 Cumulative Time Zone Update for Windows has just been released to the Microsoft Download Center for currently supported Windows Operating Systems (including Windows XP, Windows Server 2003 and Windows Vista). This update can be found in KB article 942763 (http://support.microsoft.com/kb/942763)
As noted previously, the 2008 Cumulative Time Zone Update for Windows is an annual update that sets the known, correct dates for 2008 in the Windows OS (including 2008 changes for Australia, Brazil and other countries we know that have changed their observance of DST entry/exit dates or time zones in 2008). This early drop of the update allows IT professionals and sysadmins to test the installation and deployment of the cumulative update roll-ups prior to broad distribution.
The update packages will be distributed to computers via Windows Update in early December (the second Tuesday, Dec 11).
As I was typing, I was asked: "Does this mean I have to install the updates manually?"
No. Generally, consumers should wait for the updates to be installed via Windows Update rather than download and install these from the DLC. And for end users who have their PCs managed by a central administrator, your IT folks will handle the distribution and updating of your PCs over the network. (When in doubt, ask. 😉