This didn't work for me on 10.2.8. It claimed to install but 'zdump -v /etc/localtime | grep 2007' still showed that my Mac wasn't updated with the new timezone info.
What DID work for me was someone else's updater located here:
http://www.esm.rochester.edu/esmtmp/ecs/JaguarDST.zip
If you're using Jaguar, I'd go for that one instead.
Daylight Saving Time Fix
for OS X 10.0 - 10.3
Version: 1.0