I was a late adopter of the value and power of Group Policies (GP), but is was a HUGE help in dealing with the DST fixes.
One of my clients has a network with both WinXP and Win2K clients. The XP clients were easy, I just made a script that forced all XP clients to run Microsoft's TZmove application.
For the Win2K folks, I had to really get the GP religion and do this the Microsoft Way. If you follow the links on the Microsoft site, and respond as an IT professionsl, you will eventually end up at a very detailed, step-by-step method on creating a regisitry patch and pusing it through GP. It took me about 90 minutes in all (read the directions a couple of times so you'll have an idea of what awaits). I thne force rebooted all of my Win2K machines, and pow!, the fix was applied. I was on pins and needles the whole time, but it worked and saved me a ton of time.
The link to Microsoft's DST page is:
http://support.microsoft.com/gp/cp_dst